CN103323400A - Multi-parameter integrated water quality on-line monitoring sensing system - Google Patents
Multi-parameter integrated water quality on-line monitoring sensing system Download PDFInfo
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Abstract
The invention provides a multi-parameter integrated water quality on-line monitoring sensing system. The system is characterized in that the on-line monitoring sensing system is composed of (1) a light source and signal acquisition and transmission unit, (2) an optical fiber unit, and (3) a detection window unit. The component (1) comprises 3 LED light sources and heat sinks, 3 LED driving circuit boards, 9 signal acquisition circuit boards, 9 photodiodes, a data line, and a waterproof joint component. The component (2) comprises three sets of special optical fiber components, each set comprising a reference optical fiber, two signal optical fibers and light source optical fibers, and two bandpass filters. The component (3) comprises five detection probes with different structures, and is divided into three systems which are a COD and petroleum detection system, a dissolved oxygen and chlorophyll a detection system and an algae and turbidity detection system. Light signals are transmitted to a monitoring center through optical fiber transmission, electrical signals are transmitted to the monitoring center through electrical cable transmission, and detected signals are transmitted to the monitoring center through a wireless mode. The system provided by the invention is characterized in the applied light source, the application of the special optical fiber, the special structural design, and multi-parameter integration.
Description
Technical field
The present invention relates to the integrated water quality monitoring sensor-based system of a kind of multiparameter based on the spectral detection principle, utilize sensor-based system provided by the invention to carry out quick on-line monitoring and analysis to 6 water pollution indexs such as chemical oxygen demand (COD), dissolved oxygen DO, turbidity, blue-green algae, chlorophyll a and petroleum-type in the water environment, belong to sensor technical field.
Background technology
Water is human Source of life, and the quality of quality directly affects the health of people's production, life and health.But along with socioeconomic fast development, a large amount of industrial waste waters, sanitary sewage and other discarded objects are discharged into environment water, have caused water resource pollution, and water quality constantly worsens.Water pollution also is considered to one of environment for human survival chief threat, therefore, it is monitored and controls, and especially on-line monitoring and control are imperative.
Domestic, the quality of water environment monitoring system basically forms the framework of periodic sampling, laboratory detection through construction for many years, though water quality routine monitoring and analytical technology are comparatively comprehensive, but Monitoring Data can't realize real-time sampling, fast detecting.A small amount of on-line monitoring facility is substantially from the European and American areas.Exist large, the expensive and maintenance cost of volume to cross high situation although the sampling of these equipment and monitoring quality are higher, cause the online monitoring data amount less, the equipment coverage can not satisfy the early warning demand.In addition, still there is blank in comprehensively integrated, the quick-reaction system in conjunction with front end data acquisition and early warning simulated system and emergency response decision system.
The monitoring water environment system is that 20 century 70s grow up, and in the application of the existing considerable scale of the states such as Finland, the U.S., Britain, Japan, Holland, and is included into " the environmental evaluation system " and " Defense natural calamities system " of networking.Existing water quality online auto monitoring system is that the analytical instrument with many index combines, and from sampling, analyze record, data processing composition system, realizes that real-time multiparameter monitors automatically.
Calendar year 2001, State Environmental Protection Administration was from France, Italy has introduced ambient water quality multiparameter on-line monitoring system, 10 pilot surface water quality automatic on-line monitoring stations have been built up at home, the main realization conventional five parameters of water quality and total organic carbon (TOC), the index of chemical oxygen demand (COD) (COD) detects, approximately 1,700,000 yuans of the prices of every cover system, expensive, import water quality monitoring equipment is mainly take main equipment as main, adopting the station formula that water sample to be measured is extracted in each testing tool detects, construction cost is high, surpasses the holding capacity of domestic normal operation unit; In addition, operation and maintenance cost is high, after sale service is inconvenient, and need expend suitable outer remitting every year and buy spare and accessory parts to keep its normal running, so the import Water Automatic Monitoring System is extensively promoted the use of the larger difficulty of existence at home.Although, domestic some environmental water quality monitoring instrument and systems of having researched and developed, but high-quality automatic monitoring system mostly is external introduction, and the domestic equipment proportion is very little, and sensor technology monopolizes by offshore company substantially, utilizes these sensors more may relate to the information of leaking state secrets.At present, domestic water quality monitoring majority still adopts artificial sample and monitoring station detection mode, water quality is carried out grab sampling and lab analysis detection, some department has also introduced some advanced monitoring instruments, but a small amount of several indexs of the most separately monitorings of each quasi-instrument, each instrument generally is in independent use state, and coverage rate is limited, need the intervention of a large amount of manpower and financial resources, and the real-time of data acquisition, analysis is not high.So, carry out the exploitation of multiple-quality water monitoring sensor and integrated, not only can greatly reduce cost, handled easily person, and sample pretreatment process can be incorporated in the whole monitoring system, real realization is real-time, unmanned detects, and the more important thing is to form to have the independent intellectual property right water quality monitoring system.
Yet the external integrated sensor of multiparameter all adopts high power lamp or xenon lamp, and power is large, needs particular power source (non-powered battery).Light source that the more important thing is use is not suitable for, often switch, repeatedly work, serviceable life is limited, and the integrated on-line monitoring sensing system of multiparameter rarely has report both at home and abroad, more report only relates to the combination of single parameter, probe of each parameter.
Based on above national conditions and development state abroad, the present invention intends introducing the integrated water quality monitoring sensor-based system of a kind of multiparameter based on the spectral detection principle, comprise 6 water pollution indexs such as chemical oxygen demand (COD), dissolved oxygen DO, turbidity, blue-green algae, chlorophyll a and petroleum-type, parameter is complete, volume is little, exempt from (lacking) safeguards, detects rapidly accurately, complicated, abominable Site Detection environment, cost can be adapted to low, detecting data sends in real time, be fit to on-line monitoring, great facility be provided for the water quality intellectual monitoring.
Summary of the invention
The monitoring water quality on line sensor-based system that provides a kind of multiparameter integrated is provided the object of the invention, and the monitoring sensor-based system that provides is based on the spectrum monitoring principle, is a kind of sensor-based system for the real-time online continuous monitoring of water environment multi-parameter water-quality contamination index.
Ultimate principle of the present invention is the spectrum recognition methods, comprises the mensuration of light scattering determining turbidity, UV Absorption method mensuration chemical oxygen demand (COD), fluorescence excitation spectrum method mensuration dissolved oxygen DO, chlorophyll a and blue-green algae and petroleum-type etc.According to water environment turbidity parameter measurement principle, adopt 617nm wavelength red light irradiation water body, collect scattered light in 90 ° of directions of incident light, measure the turbidity that the scattering light intensity obtains water sample.According to the uv absorption principle, adopt 254nm ultraviolet lighting water jetting body, collect the absorbance that catoptrical intensity obtains water sample by detection window, because the organic contaminant in the water body has absorption to the 254nm ultraviolet light, obtain chemical oxygen demand (COD) (COD) by fluorescent absorption method mensuration.Water body Determination of Chlorophyll a is the fluorescence that 685nm is sent in meeting under the exciting of 473nm blue light at wavelength, blue-green algae is the fluorescence that 655nm is sent in meeting under the exciting of light source of 617nm at wavelength, the fluorescence of 360nm is sent in the meeting under the exciting of 254nm ultraviolet light of petroleum-type pollutant, adopt 473nm wavelength light source irradiation oxygen sensing film can send the fluorescence of 590nm, can measure respectively the water pollutants such as dissolved oxygen DO, chlorophyll a, blue-green algae and petroleum-type based on this fluorescence excitation spectrum method.Because the needed light source of these parameters has common point, therefore can be integrated into 6 parameter water quality monitoring sensor-based systems, wherein the 254nm light source is used for the detection of COD and petroleum-type index, and the 617nm light source is used for the monitoring of turbidity and blue-green algae index, and 473nm is used for the monitoring of chlorophyll a and dissolved oxygen DO.
On-line monitoring sensor-based system provided by the present invention mainly is comprised of light source and signals collecting and transmitting element, fiber unit, detection window unit etc., and the structure of whole sensor-based system as shown in Figure 1.Wherein (one) light source and signals collecting and transmitting element comprise: 3 led light sources and heat radiator, 3 led drive circuit plates, 9 block signal collecting circuit boards, 9 parts such as photosensitive tube, data line and water joint form; (2) fiber unit comprises three groups of special optical fiber assemblies, and every group of optical fiber comprises reference optical fiber, signal optical fibre 1, signal optical fibre 2, luminous source optical fiber, 2 bandpass filters etc.; (3) the detection window unit comprises the probe of five different structures, it is detection cell structure probe, oxygen sensing film probe, right angle fibre-optical probe and 2 tack probes can be divided into COD and petroleum-type and detect sensor-based system, dissolved oxygen DO and chlorophyll a detection sensor-based system and blue-green algae system.Above (one) and (two) unit package are in the stainless steel waterproof case, and light signal is by Optical Fiber Transmission, and electric signal transmits by cable, and the detection window unit is used for the contact water body and detects outside the stainless steel waterproof case.The signal that detects sends to Surveillance center by wireless mode.
Three are detected sensor-based system and are described below:
1) COD and petroleum-type detect sensor-based system
254nm UV-LED(20uW) light source is by coupling fiber, and the first via is measured the current signal of photoelectric tube as the reference value of the intensity of light source as the direct lead-in light fulgurite of intensity of light source reference light; The second the tunnel is transferred to the detection window that inserts in the water body, ultraviolet light after collecting in water body organism etc. and absorb by signal optical fibre, conduction is through bandpass filter (centre wavelength 254nm, half-peak breadth 30nm) enters ultraviolet and strengthen responsive photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing; Third Road is transferred to the detection window that inserts in the water body, collect the fluorescence signal that the petroleum-type pollutant is excited to produce by signal optical fibre, conduction is through bandpass filter (centre wavelength 360nm, half-peak breadth 30nm) enters ultraviolet and strengthen responsive photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing.
2) dissolved oxygen DO and chlorophyll a detect sensor-based system
The highlighted LED(350mW of 473nm blue light) light source is by coupling fiber, and the first via is measured the current signal of photoelectric tube as the reference value of the intensity of light source as the direct lead-in light fulgurite of intensity of light source reference light; The second the tunnel is transferred to the oxygen sensing film that inserts in the water body, ruthenium complex in the film is excited by 473nm blue light direct irradiation and produces fluorescence (centre wavelength 590nm), fluorescence signal conducts through bandpass filter (centre wavelength 590nm by signal optical fibre, half-peak breadth 30nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit plate, signal is through single-chip microcomputer record, analysis and processing; Third Road directly is transferred to the chlorophyll a that excites in the water body in the water body and produces fluorescence (centre wavelength 685nm), fluorescence signal conducts through bandpass filter (centre wavelength 685nm by signal optical fibre, half-peak breadth 30nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing.
3) blue-green algae and turbidity detect sensor-based system
The highlighted LED(350mW of 617nm ruddiness) light source is by coupling fiber, and the first via is measured the current signal of photoelectric tube as the reference value of the intensity of light source as the direct lead-in light fulgurite of intensity of light source reference light; The second the tunnel is transferred to sensor probe direct irradiation water body in the insertion water body, excite blue-green algae to produce fluorescence (centre wavelength 655nm), fluorescence signal conducts through bandpass filter (centre wavelength 655nm by signal optical fibre, half-peak breadth 10nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing; Third Road is transferred to and inserts sensor probe direct irradiation water body in the water body, collect scattered light in 90 ° of directions of incident light, conduct through bandpass filter (centre wavelength 617nm by signal optical fibre, half-peak breadth 15nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit plate, signal is through single-chip microcomputer record, analysis and processing.
All signals that detect all can send to the background monitoring center by wireless mode.
Concrete each module is described below:
1) COD and petroleum-type detect sensor-based system
The sensor probe detection window: adopt Design of Screw Thread, optical path length is adjustable, selects the ultraviolet high reflectivity mirror, and probe directly inserts water body to be measured and tests.
Special optical fiber: according to detecting principle for improving the design of detection efficiency optical fiber as shown in Figure 2, source ends optical fiber is 4 cores, and fibre diameter is respectively the 1 100 μ m(reference light in center) and peripheral 3 400 μ m(light sources); Detection probe end optical fiber is 12 cores, and fibre diameter is 400 μ m, and wherein 3 is light source, and 36 are the collection fluorescence signal in order to collect reflected light signal, but the Effective Raise light collection efficiency; 1# signal end optical fiber is 3 cores, and diameter is 400 μ m, and the ultraviolet signal of collecting is coupled into optical filter and photosensitive tube, and 2# signal end optical fiber is 6 cores, and diameter is 400 μ m, and the fluorescence signal of collecting is coupled into optical filter and photosensitive tube.All fibre-optical splices are all selected the SMA905 adapter, and fiber optic materials is all selected high grade quartz optical fiber, transmission wavelength scope 200nm-1100nm.
UV-LED: adopting wavelength is the ultraviolet LED of 254nm, and power is 20uW, the 5V power supply, and LED is encapsulated on the sexangle heat radiator, and driving circuit provides firm power output for LED.
Signals collecting: after photosensitive tube is converted into current signal with light signal, after carrying out signal amplification, filtering etc. and process by signal acquisition circuit, sends into the rear end and analyze, store and be wirelessly transmitted to Surveillance center, or the direct display measurement value of the machine.
2) dissolved oxygen DO and chlorophyll a detect sensor-based system
Sensor probe: be divided into dissolved oxygen probe and chlorophyll a probe.Dissolved oxygen probe is coated in the outside, transparent plastic adapter termination with oxygen molecule sensitive membrane collosol and gel in the water body, and after drying was processed, just directly the contact measured water body was tested; The chlorophyll a probe is the stainless steel forward type, and light source shines directly into and excites chlorophyll a to produce fluorescence in the water body, enters photosensitive tube by probe collection fluorescence and detects.
Special optical fiber: according to detecting principle for improving the design of detection efficiency optical fiber as shown in Figure 2, source ends optical fiber is 5 cores, and fibre diameter is respectively the 1 100 μ m(reference light in center) and peripheral 4 400 μ m(light sources); 1# detection probe end optical fiber is that 7 cores are the chlorophyll a probe, and fibre diameter is 400 μ m, and wherein 2 at center is light source, and peripheral 5 are the collection fluorescence signal, but Effective Raise phosphor collection efficient; 2# detection probe end optical fiber is that 7 cores are dissolved oxygen probe, and fibre diameter is 400 μ m, and wherein 2 at center is light source, and peripheral 5 are the collection fluorescence signal, but Effective Raise phosphor collection efficient; 1# signal end optical fiber is 5 cores, and diameter is 400 μ m, and the fluorescence signal of collecting is coupled into optical filter and photosensitive tube, and 2# signal end optical fiber also is 5 cores, and diameter is 400 μ m, and the fluorescence signal of collecting is coupled into optical filter and photosensitive tube.All fibre-optical splices are all selected the SMA905 adapter, and fiber optic materials is all selected high grade quartz optical fiber, transmission wavelength scope 200nm-1100nm.
Highlighted LED: adopting wavelength is the highlighted blue-ray LED of 473nm, and power is 350mW, the 5V power supply, and LED is encapsulated on the sexangle heat radiator, and driving circuit provides firm power output for LED.
Signals collecting: after photosensitive tube is converted into current signal with light signal, after carrying out signal amplification, filtering etc. and process by signal acquisition circuit, sends into the rear end and analyze, store and be wirelessly transmitted to Surveillance center, or the direct display measurement value of the machine.
3) blue-green algae and turbidity detect sensor-based system
Sensor probe: be divided into blue-green algae probe and turbidity probe tip.The chlorophyll a probe is the stainless steel forward type, and light source shines directly into and excites blue-green algae to produce fluorescence in the water body, enters photosensitive tube by probe collection fluorescence and detects.Turbidity probe tip becomes 90 ° of structural design manufacturings for receiving light with incident light, can directly insert water body to be measured to test;
Special optical fiber: according to detecting principle for improving the design of detection efficiency optical fiber as shown in Figure 2, source ends optical fiber is 4 cores, and fibre diameter is respectively the 1 100 μ m(reference light in center) and peripheral 3 400 μ m(light sources); 1# detection probe end optical fiber is that 7 cores are the blue-green algae probe, and fibre diameter is 400 μ m, and wherein 1 at center is light source, and peripheral 6 are the collection fluorescence signal, but Effective Raise phosphor collection efficient; 2# detection probe end optical fiber is that 6 cores are turbidity probe tip, and fibre diameter is 400 μ m, and wherein 2 at center is light source, and peripheral 4 are the collection fluorescence signal, but Effective Raise phosphor collection efficient; 1# signal end optical fiber is 6 cores, and diameter is 400 μ m, and the fluorescence signal of collecting is coupled into optical filter and photosensitive tube, and 2# signal end optical fiber also is 4 cores, and diameter is 400 μ m, and the scattered light signal of collecting is coupled into optical filter and photosensitive tube.All fibre-optical splices are all selected the SMA905 adapter, and fiber optic materials is all selected high grade quartz optical fiber, transmission wavelength scope 200nm-1100nm.
Highlighted LED: adopting wavelength is the highlighted blue-ray LED of 617nm, and power is 350mW, the 5V power supply, and LED is encapsulated on the sexangle heat radiator, and driving circuit provides firm power output for LED.
Signals collecting: after photosensitive tube is converted into current signal with light signal, after carrying out signal amplification, filtering etc. and process by signal acquisition circuit, sends into the rear end and analyze, store and be wirelessly transmitted to Surveillance center, or the direct display measurement value of the machine.
4) stainless steel waterproof case
Whole sensor-based system selects the stainless steel waterproof case to encapsulate, and IP69 water joints are selected in all external lugs, are suitable for directly entering water body, and enters the profundal zone and measure.
Transducer calibration method of the present invention is to adopt the detectors such as standard chemical oxygen demand, dissolved oxygen DO, chlorophyll a, blue-green algae, turbidity and petroleum-type to measure the variation of the pollutant levels from the low concentration to the high concentration in the water body, adopting simultaneously sensor of the present invention to measure the light signal strength value compares, obtain both linear relationships, as shown in Figure 4, again by the anti-contaminants associated concentration that pushes away unknown water body to be measured of linear relationship curve.
The integrated water quality pollutant on-line monitoring of the multiparameter sensor-based system that the present invention makes up is owing to selecting LED as light source, can repeatedly measure or METHOD FOR CONTINUOUS DETERMINATION, antijamming capability is strong, long service life, be suitable for water body long-time every day of repeatedly continuous monitoring (such as 1 time/10 minutes), be specially adapted to the water quality detection of emergent accident, need high frequency time to detect, to play a role, be with a wide range of applications at surface water, Ground water Quality Survey.Simultaneously, to the integrated sensor of several indexs of the present invention, have no report both at home and abroad, the 3rd, more be the combination of single parameter in the existing report, probe of each parameter, and the present invention reduces manufacturing cost greatly by the integration of structural design cleverly and critical component, and estimated cost only is equivalent to original about 1/3～1/6, use in enormous quantities the occasion of sensor probe for needs, sensor is necessary cheaply.
In sum, sensor-based system provided by the invention is characterised in that: the light source that a) uses, and b) special optical fiber uses, and c) special construction design and multiparameter are integrated.
Description of drawings
Fig. 1 is the integrated monitoring water quality on line sensor-based system of the multiparameter of embodiment of the invention general structure schematic diagram, among the figure:
1. data line 20. dissolved oxygen probes
2. water joint 21. probe adapters
3. waterproof stainless steel casing 22. oxygen sensing films
4.COD signal acquisition circuit plate 23. blue-green algaes probe
5.UV-LED drive circuit board 24.90 degree optical fiber
6.254nm reference optical signal collecting circuit board 25. turbidity probe tip
7. petroleum-type signal acquisition circuit plate 26. chlorophyll a signal acquisition circuit plates
8.COD signal photosensitive tube and the logical filter of 254nm band 27.473nm reference optical signal collecting circuit board
Mating plate 28.473nmLED drive circuit board
9.UV-LED light source and heat radiator 29. dissolved oxygen DO signal acquisition circuit plates
10.254nm reference optical signal photosensitive tube 30. blue-green algae signal acquisition circuit plates
11. petroleum-type signal photosensitive tube and the logical 31.617nm reference optical signal collecting circuit board of 360nm band
Optical filter 32.617nmLED driving circuit
12. petroleum-type signal optical fibre 33. turbidity signal acquisition circuit plates
13.254nm reference light optical fiber 34. blue-green algae signal photosensitive tubes and 655nm band are logical
14.254nm luminous source optical fiber optical filter
15.COD signal optical fibre 35. turbidity signal photosensitive tubes and 617nm band are logical
16. probe detection window (light path is adjustable) optical filter
17. flow cell 36. turbidity signal optical fibres
18. catoptron 37.617nmLED and heat radiator
19. chlorophyll a probe 38.617nm signal fluorescence optical fiber
39.617nm reference optical signal photosensitive tube 46.473nm luminous source optical fiber
40.617nm reference light optical fiber 47. dissolved oxygen DO signal optical fibres
41. blue-green algae signal optical fibre 48.590nm bandpass filter
42. chlorophyll a signal photosensitive tube 49. dissolved oxygen DO signal photosensitive tubes
43.685nm bandpass filter 50.473nmLED and heat radiator
44. chlorophyll a signal optical fibre 51.473nm light source reference light photosensitive tube
45.473nm light source reference optical fiber
Three groups of optical fiber structure schematic diagram of the integrated monitoring water quality on line sensor-based system of Fig. 2 parameter how provided by the invention, example is described as follows among the figure:
A figure is COD and petroleum-type detection fiber
111.COD flashlight terminal (3 cores, optical fiber core diameter are 400 μ m)
112. reference light terminal (1 core, optical fiber core diameter are 100 μ m)
113. light source light terminal (4 cores, optical fiber core diameter are 1 core, 100 μ m and 3 cores, 400 μ m)
114. petroleum-type flashlight terminal (6 cores, optical fiber core diameter are 400 μ m)
115. detection probe terminal (12 cores, optical fiber core diameter are 400 μ m, and 3 cores are light source, and 3 cores are the COD flashlight, and 6 cores are the petroleum-type flashlight, are interspersed)
B figure is chlorophyll a and dissolved oxygen DO detection fiber
116. chlorophyll a flashlight terminal (5 cores, optical fiber core diameter are 400 μ m)
112. reference light terminal (1 core, optical fiber core diameter are 100 μ m)
118. light source light terminal (5 cores, optical fiber core diameter are 1 core, 100 μ m and 4 cores, 400 μ m)
119. dissolved oxygen DO flashlight terminal (5 cores, optical fiber core diameter are 400 μ m)
120. chlorophyll a probe terminal (7 cores, optical fiber core diameter are 400 μ m, and 2 cores are light source, and 5 cores are the chlorophyll a flashlight, and the center is light source, and the periphery is flashlight)
121. dissolved oxygen probe terminal (7 cores, optical fiber core diameter are 400 μ m, and 2 cores are light source, and 5 cores are the chlorophyll a flashlight, and the center is light source, and the periphery is flashlight)
C figure is blue-green algae and turbidity detection fiber
122. blue-green algae flashlight terminal (4 cores, optical fiber core diameter are 400 μ m)
112. reference light terminal (1 core, optical fiber core diameter are 100 μ m)
113. light source light terminal (4 cores, optical fiber core diameter are 1 core, 100 μ m and 3 cores, 400 μ m)
125. turbidity flashlight terminal (4 cores, optical fiber core diameter are 400 μ m)
126. blue-green algae probe terminal (7 cores, optical fiber core diameter are 400 μ m, and 1 core is light source, and 6 cores are the blue-green algae flashlight, and the center is light source, and the periphery is flashlight)
127. turbidity probe tip terminal (6 cores, optical fiber core diameter are 400 μ m, and 2 cores are light source, and 4 cores are the turbidity flashlight, the fine one-tenth 90 degree structures of two-beam)
Fig. 3 is the linear relationship chart of detected parameters and the signal intensity of the embodiment of the invention.
Embodiment
Further set forth substantive distinguishing features of the present invention and significant progressive below in conjunction with accompanying drawing, but the present invention absolutely not only is confined to embodiment.
Embodiment 1:
The structure of the integrated monitoring water quality on line sensor-based system of multiparameter provided by the present invention as shown in Figure 1.Describedly mainly formed by light source and signals collecting and transmitting element, fiber unit, detection window unit etc. for sensor-based system.
Wherein (one) light source and signals collecting and transmitting element comprise: UV-LED light source and heat radiator 9,473nmLED and heat radiator 50,617nmLED and heat radiator 37, the parts such as UV-LED drive circuit board 5,473nmLED drive circuit board 28,617nmLED drive circuit board 32,9 block signal collecting circuit boards (4,6,7,26,27,29,30,31,33), 9 photosensitive tubes (8,10,11,34,35,39,42,49,51), data line and water joint form; Architectural feature is:
1. an end of COD signal acquisition circuit plate (4) links to each other with data line (1), and the other end is connected with 254nm bandpass filter (8) with COD signal photosensitive tube, and the other end of band filter (8) is connected with COD signal optical fibre (15);
2. an end of UV-LED drive circuit board (5) links to each other with data line (1), and the other end is connected with UV-LED light source and heat radiator (9), and the other end of UV-LED light source and heat radiator (9) is connected with 254nm luminous source optical fiber (14);
3. an end of 254nm reference optical signal collecting circuit board (6) links to each other with data line (1), the other end is connected with 254nm reference optical signal photosensitive tube (10), and the other end of 254nm reference optical signal photosensitive tube (10) is connected with 254nm reference light optical fiber (13);
4. an end of petroleum-type signal acquisition circuit plate (7) links to each other with data line (1), the other end is connected with 360nm bandpass filter (11) with petroleum-type signal photosensitive tube, and the other end of signal photosensitive tube and 360nm bandpass filter (11) is connected with petroleum-type signal optical fibre (12);
5. an end of chlorophyll a signal acquisition circuit plate (26) is connected with data line (1), the other end links to each other with chlorophyll a signal photosensitive tube (42), and the other end of chlorophyll a signal photosensitive tube (42) links to each other with 685nm bandpass filter (43), and the 685nm bandpass filter other end is connected with chlorophyll a signal optical fibre (44) again;
6. an end of 473nm reference optical signal collecting circuit board (27) links to each other with data line, the other end is connected with 473nm light source reference light photosensitive tube (51), and the other end of 473nm light source reference light photosensitive tube (51) is connected with 473nm light source reference optical fiber (45), and the other end of reference optical fiber (45) then is connected with 473nm luminous source optical fiber (46);
7. an end of 473nmLED drive circuit board (28) links to each other with data line (1), and the other end is connected with 473nmLED light source and heat radiator (50), and the other end of 473nmLED light source and heat radiator (50) is connected with 473nm luminous source optical fiber (46);
8. an end of dissolved oxygen DO signal acquisition circuit plate (29) links to each other with data line (1), the other end then is connected with dissolved oxygen DO signal photosensitive tube (49), and the other end of dissolved oxygen DO signal photosensitive tube (49) is connected with dissolved oxygen DO signal optical fibre (47) by 590nm bandpass filter (48) again;
9. an end of blue-green algae signal acquisition circuit plate (30) links to each other with data line (1), the other end is connected 34 with blue-green algae signal photosensitive tube with the 655nm bandpass filter) be connected, blue-green algae signal photosensitive tube is connected 34 with the 655nm bandpass filter) the other end then be connected with blue-green algae signal optical fibre (41);
10. an end of 617nm reference optical signal collecting circuit board (31) links to each other with data line (1), the other end is connected with 617nm reference optical signal photosensitive tube (39), and the other end of 617nm reference optical signal photosensitive tube (39) is connected with 617nm light source reference optical fiber (40), and 617nm light source reference optical fiber (40) then is connected with 617nm signal optical fibre (38);
(2) fiber unit comprises three groups of special optical fiber assemblies, be respectively COD and petroleum-type detection fiber (12,13,14,15,16), chlorophyll a and dissolved oxygen DO detection fiber (19,22,44,45,46,47), blue-green algae and turbidity detection fiber (23,24,25,36,38,40,41), every group of optical fiber comprises reference optical fiber, 2 groups of signal optical fibres, luminous source optical fiber, 2 bandpass filters;
(3) the detection window unit comprises the probe of 5 different structures, detection cell structure probe (forming by being numbered 16,17,18 parts), oxygen sensing film probe (forming by being numbered 20,21,22 parts), right angle fibre-optical probe (forming by being numbered 24,25 parts), 2 tack probes (being formed by 1 parts and 2,3 parts respectively) and stainless steel casings (3).Above one, two unit package are in stainless steel casing, and light signal is by Optical Fiber Transmission, and electric signal transmits by cable, and the detection window unit is used for the contact water body and detects outside stainless steel casing.
Wherein COD and the petroleum-type detection probe course of work are: centre wavelength is the UV-LED(20uW of 254nm) light source is by coupling fiber, one the tunnel as the direct lead-in light fulgurite of intensity of light source reference light, measures the current signal of photoelectric tube as the reference value of the intensity of light source; Another road is transferred to the detection cell irradiation water body that inserts in the water body, ultraviolet light after collecting in water body organism etc. and absorb by signal optical fibre, conduction is through bandpass filter (centre wavelength 254nm, half-peak breadth 30nm) enters ultraviolet and strengthen responsive photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing; After collecting by signal optical fibre, another route 254nm fluorescence excitation signal (centre wavelength 360nm) enters bandpass filter and photosensitive tube carries out opto-electronic conversion, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing.
Dissolved oxygen DO and the chlorophyll a detection probe course of work are: the highlighted LED(350mW of 473nm blue light) light source is by coupling fiber, and the first via is measured the current signal of photoelectric tube as the reference value of the intensity of light source as the direct lead-in light fulgurite of intensity of light source reference light; The second the tunnel is transferred to the oxygen sensing film that inserts in the water body, ruthenium complex in the film is excited by 473nm blue light direct irradiation and produces fluorescence (centre wavelength 590nm), fluorescence signal conducts through bandpass filter (centre wavelength 590nm by signal optical fibre, half-peak breadth 30nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing; Third Road directly is transferred to the chlorophyll a that excites in the water body in the water body and produces fluorescence (centre wavelength 685nm), fluorescence signal conducts through bandpass filter (centre wavelength 685nm by signal optical fibre, half-peak breadth 30nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing.
Blue-green algae and the turbidity detection probe course of work: the highlighted LED(350mW of 617nm ruddiness) light source is by coupling fiber, and the first via is measured the current signal of photoelectric tube as the reference value of the intensity of light source as the direct lead-in light fulgurite of intensity of light source reference light; The second the tunnel is transferred to sensor probe direct irradiation water body in the insertion water body, excite blue-green algae to produce fluorescence (centre wavelength 655nm), fluorescence signal conducts through bandpass filter (centre wavelength 655nm by signal optical fibre, half-peak breadth 10nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing; Third Road is transferred to and inserts sensor probe direct irradiation water body in the water body, collect scattered light in 90 ° of directions of incident light, conduct through bandpass filter (centre wavelength 617nm by signal optical fibre, half-peak breadth 15nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing.
All signals that detect all can send to the background monitoring center by wireless mode.
Wherein:
(1) 473nmLED and 617nmLED are available from sky, Shenzhen credit photoelectricity company limited, model is respectively ball-top-473, ball-top-617, UV-LED is available from U.S. SETI company, model is UVTOP255, all photosensitive tubes are available from German Silicon Sensor International AG company, and model is PC10-2TO5;
(2) the signal acquisition circuit plate is general voltage-stabilizing output circuit, and main performance nA level current signal amplifies, binary channel, utmost point low noise;
(3) the 473/617nmLED drive circuit board is that general signal amplifies and treatment circuit, main performance index: power consumption 350mW, operating voltage 3.7-4.2V, steady current output 350mA; The UV-LED drive circuit board is that general signal amplifies and treatment circuit, main performance index: power consumption 20uW, operating voltage 3.7-4.2V, steady current output 20mA;
(4) in COD and the petroleum-type detection fiber assembly, COD flashlight terminal (3 cores, optical fiber core diameter are 400 μ m); Reference light terminal (1 core, optical fiber core diameter are 100 μ m); Light source light terminal (4 cores, optical fiber core diameter are 1 core, 100 μ m and 3 cores, 400 μ m); Petroleum-type flashlight terminal (6 cores, optical fiber core diameter are 400 μ m); Detection probe terminal (12 cores, optical fiber core diameter are 400 μ m, and 3 cores are light source, and 3 cores are the COD flashlight, and 6 cores are the petroleum-type flashlight, are interspersed);
(5) in chlorophyll a and the dissolved oxygen DO detection fiber assembly, chlorophyll a flashlight terminal (5 cores, optical fiber core diameter are 400 μ m), reference light terminal (1 core, the optical fiber core diameter is 100 μ m), light source light terminal (5 cores, optical fiber core diameter are 1 core, 100 μ m and 4 cores, 400 μ m), dissolved oxygen DO flashlight terminal (5 cores, the optical fiber core diameter is 400 μ m), (7 cores, optical fiber core diameter are 400 μ m to chlorophyll a probe terminal, 2 cores are light source, 5 cores are the chlorophyll a flashlight, and the center is light source, and the periphery is flashlight), dissolved oxygen probe terminal (7 cores, the optical fiber core diameter is 400 μ m, and 2 cores are light source, and 5 cores are the chlorophyll a flashlight, the center is light source, and the periphery is flashlight);
(6) in blue-green algae and the turbidity detection fiber assembly, blue-green algae flashlight terminal (4 cores, optical fiber core diameter are 400 μ m), reference light terminal (1 core, the optical fiber core diameter is 100 μ m), light source light terminal (4 cores, optical fiber core diameter are 1 core, 100 μ m and 3 cores, 400 μ m), turbidity flashlight terminal (4 cores, the optical fiber core diameter is 400 μ m), (7 cores, optical fiber core diameter are 400 μ m to blue-green algae probe terminal, and 1 core is light source, 6 cores are the blue-green algae flashlight, the center is light source, and the periphery is flashlight), turbidity probe tip terminal (6 cores, the optical fiber core diameter is 400 μ m, 2 cores are light source, and 4 cores are the turbidity flashlight, the fine one-tenth 90 degree structures of two-beam).
Embodiment 2:
Sensing system of the present invention comprises 5 detection probe, is respectively COD and petroleum-type detection probe, chlorophyll a detection probe, blue-green algae detection probe, turbidity detection probe and dissolved oxygen DO detection probe.Wherein COD and petroleum-type detection probe structure are comprised of parts such as signal optical fibre, luminous source optical fiber, detection probe optic fibre connector, detection flow cell, catoptrons; Chlorophyll a is identical with the blue-green algae sonde configuration, is comprised of signal optical fibre, luminous source optical fiber, detection probe optic fibre connector; The turbidity probe tip structure is by signal optical fibre, luminous source optical fiber, detection probe optic fibre connector (launching fiber becomes an angle of 90 degrees with reception optical fiber); Dissolved oxygen probe is comprised of signal optical fibre, luminous source optical fiber, detection probe optic fibre connector, adapter, oxygen sensing film etc.Wherein have 3 groups of optical fiber components, after the present invention carries out the special construction design according to application requirements, provided by the Nanjing fine company of the female spy processing of planting, flow cell and adapter are according to physical dimension design and the processing of fibre-optical probe, and all probes can directly enter the detection that water body carries out relevant parameter.
Embodiment 3:
As shown in Figure 3, the scaling method of 6 sensors of the present invention is to adopt corresponding standard detection instrument to demarcate.Each parameter calibration method is as follows:
(1) COD scaling method concrete steps are:
1) water sample of preparing 10 different chemical oxygen demand concentration with beaker is as sample to be tested, and volume is 100mL;
2) adopt standard chemical oxygen demand assay method and instrument to measure respectively this 10 sample (units: mg/L);
3) the described sensor probe insertion of this patent is inserted respectively in 10 samples, plugged is tested, and obtains the magnitude of voltage (unit: mV) of 10 different chemical oxygen demand concentration;
4) 10 chemical oxygen demand values that measure take the standard chemical oxygen demand are as horizontal ordinate, and the magnitude of voltage that measures 10 corresponding samples take the described sensor of this patent is as ordinate, and the drawing standard curve obtains the linear relationship curve of sensor, thus calibration sensor;
5) measure the chemical oxygen demand (COD) concentration of unknown water body to be measured with the sensor of demarcating.
(2) dissolved oxygen DO scaling method concrete steps are:
1) prepares the pure water of 500mL volume with beaker;
2) initialization standard dissolved oxygen instrument will be popped one's head in to insert and be detected initial dissolution oxygen value (unit: mg/L) in the pure water;
3) the described sensor probe of this patent is inserted in the same pure water, plugged is tested, and obtains the magnitude of voltage (unit: mV) of fluorescence intensity signals;
4) in pure water, slowly pass into nitrogen, reduce in the water body and dissolve oxygen concentration, measure simultaneously respectively 3 dissolved oxygen value and magnitudes of voltage under the concentration conditions with standard dissolved oxygen meter and the described sensor of this patent;
5) in pure water, slowly pass into oxygen, improve in the water body and dissolve oxygen concentration, measure simultaneously respectively 3 dissolved oxygen value and magnitudes of voltage under the concentration conditions with standard dissolved oxygen meter and the described sensor of this patent;
6) measure 7 dissolved oxygen values as horizontal ordinate take the standard dissolved oxygen instrument, measure 7 corresponding magnitudes of voltage as ordinate take the described sensor of this patent, the drawing standard curve obtains the linear relationship curve of sensor, thus calibration sensor;
7) measure the dissolved oxygen concentration of unknown water body to be measured with the sensor of demarcating.
(3) scaling method of chlorophyll a, blue-green algae, petroleum-type and turbidity is identical with the COD scaling method.
Claims (5)
1. integrated monitoring water quality on line sensor-based system of multiparameter, it is characterized in that the on-line monitoring sensor-based system that provides is comprised of light source and signals collecting and transmitting element, fiber unit and detection window unit, wherein (one) light source and signals collecting and transmitting element comprise: 3 led light sources and heat radiator, 3 led drive circuit plates, 9 block signal collecting circuit boards, 9 photosensitive tubes, data line and water joint parts form; (2) fiber unit comprises three groups of special optical fiber assemblies, and every group of optical fiber comprises reference optical fiber, two signal optical fibres, luminous source optical fiber, 2 bandpass filters; (3) the detection window unit comprises the detection probe of five different structures, can be divided into three system: COD and petroleum-type detection system, dissolved oxygen DO and chlorophyll a detection system and blue-green algae and turbidity and detect sensor-based system; Above-mentioned (one) and (two) unit package are in stainless steel casing, and light signal is by Optical Fiber Transmission, and electric signal transmits by cable, and the detection window unit is used for the contact water body and detects outside the stainless steel waterproof case; The signal that detects sends to Surveillance center by wireless mode.
2. by sensor-based system claimed in claim 1, it is characterized in that the architectural feature of the led light source described in light source and the signals collecting transmitting element and heat radiator, led drive circuit plate, signal acquisition circuit plate and light is:
1. an end of COD signal acquisition circuit plate (4) links to each other with data line (1), the other end is connected with 254nm bandpass filter (8) with COD signal photosensitive tube, and the other end of COD signal photosensitive tube and 254nm band filter (8) is connected with COD signal optical fibre (15);
2. an end of UV-LED drive circuit board (5) links to each other with data line (1), and the other end is connected with UV-LED light source and heat radiator (9), and the other end of UV-LED light source and heat radiator (9) is connected with 254nm luminous source optical fiber (14);
3. an end of 254nm reference optical signal collecting circuit board (6) links to each other with data line (1), the other end is connected with 254nm reference optical signal photosensitive tube (10), and the other end of 254nm reference optical signal photosensitive tube (10) is connected with 254nm reference light optical fiber (13);
4. an end of petroleum-type signal acquisition circuit plate (7) links to each other with data line (1), the other end is connected with 360nm bandpass filter (11) with petroleum-type signal photosensitive tube, and the other end of signal photosensitive tube and 360nm bandpass filter (11) is connected with petroleum-type signal optical fibre (12);
5. an end of chlorophyll a signal acquisition circuit plate (26) is connected with data line (1), the other end links to each other with chlorophyll a signal photosensitive tube (42), and the other end of chlorophyll a signal photosensitive tube (42) links to each other with 685nm bandpass filter (43), and the 685nm bandpass filter other end is connected with chlorophyll a signal optical fibre (44) again;
6. an end of 473nm reference optical signal collecting circuit board (27) links to each other with data line, the other end is connected with 473nm light source reference light photosensitive tube (51), and the other end of 473nm light source reference light photosensitive tube (51) is connected with 473nm light source reference optical fiber (45), and the other end of reference optical fiber (45) then is connected with 473nm luminous source optical fiber (46);
7. an end of 473nmLED drive circuit board (28) links to each other with data line (1), and the other end is connected with 473nmLED light source and heat radiator (50), and the other end of 473nmLED light source and heat radiator (50) is connected with 473nm luminous source optical fiber (46);
8. an end of dissolved oxygen DO signal acquisition circuit plate (29) links to each other with data line (1), the other end then is connected with dissolved oxygen DO signal photosensitive tube (49), and the other end of dissolved oxygen DO signal photosensitive tube (49) is connected with dissolved oxygen DO signal optical fibre (47) by 590nm bandpass filter (48) again;
9. an end of blue-green algae signal acquisition circuit plate (30) links to each other with data line (1), the other end is connected 34 with blue-green algae signal photosensitive tube with the 655nm bandpass filter) be connected, blue-green algae signal photosensitive tube is connected 34 with the 655nm bandpass filter) the other end then be connected with blue-green algae signal optical fibre (41);
10. an end of 617nm reference optical signal collecting circuit board (31) links to each other with data line (1), the other end is connected with 617nm reference optical signal photosensitive tube (39), and the other end of 617nm reference optical signal photosensitive tube (39) is connected with 617nm light source reference optical fiber (40), and 617nm light source reference optical fiber (40) then is connected with 617nm signal optical fibre (38);
One end of 617nmLED driving circuit (32) links to each other with data line (1), and the other end then is connected with heat radiator (37) with 617nmLED, and 617nmLED links to each other with 617nm signal optical fibre (38) with heat radiator (37);
3. by claim 1 or 2 described sensor-based systems, it is characterized in that described sensor-based system is according to five detection probe, be respectively detection cell structure probe, oxygen sensing film probe, right angle fibre-optical probe and 2 tack probes, it can be divided into COD and petroleum-type detection system, chlorophyll a and dissolved oxygen DO detection system, blue-green algae and three searching systems of turbidity detection system;
Wherein, 1) COD and petroleum-type detect sensor-based system
A) sensor probe detection window: adopt Design of Screw Thread, optical path length is adjustable, selects the ultraviolet high reflectivity mirror, and probe directly inserts water body to be measured and tests;
B) source ends optical fiber is 4 cores, and fibre diameter is respectively the 1 100 μ m reference light in center and peripheral 3 400 μ m light sources; Detection probe end optical fiber is 12 cores, and fibre diameter is 400 μ m, and wherein 3 is light source, and 3 are the collection reflected light signal, and 6 for collecting fluorescence signal, Effective Raise light collection efficiency; 1# signal end optical fiber is 3 cores, and diameter is 400 μ m, and the ultraviolet signal of collecting is coupled into optical filter and photosensitive tube, and 2# signal end optical fiber is 6 cores, and diameter is 400 μ m, and the fluorescence signal of collecting is coupled into optical filter and photosensitive tube; All fibre-optical splices are all selected the SMA905 adapter;
C) UV-LED: adopting wavelength is the ultraviolet LED of 254nm, and power is 20uW, the 5V power supply, and LED is encapsulated on the sexangle heat radiator, and driving circuit provides firm power output for LED;
D) signals collecting: after photosensitive tube is converted into current signal with light signal, is undertaken that signal amplifies and after filtering processes, send into the rear end and analyze, store and be wirelessly transmitted to Surveillance center by signal acquisition circuit, or direct display measurement value;
2) dissolved oxygen DO and chlorophyll a detect sensor-based system
A) sensor probe: be divided into dissolved oxygen probe and chlorophyll a probe.Dissolved oxygen probe is coated in the outside, transparent plastic adapter termination with oxygen molecule sensitive membrane collosol and gel in the water body, and after drying was processed, directly the contact measured water body was tested; The chlorophyll a probe is the stainless steel forward type, and light source shines directly into and excites chlorophyll a to produce fluorescence in the water body, enters photosensitive tube by probe collection fluorescence and detects;
B) source ends optical fiber is 5 cores, and fibre diameter is respectively the 1 100 μ m reference light in center and peripheral 4 400 μ m light sources; 1# detection probe end optical fiber is that 7 cores are the chlorophyll a probe, and fibre diameter is 400 μ m, and wherein 2 at center is light source, and peripheral 5 are the collection fluorescence signal, but Effective Raise phosphor collection efficient; 2# detection probe end optical fiber is that 7 cores are dissolved oxygen probe, and fibre diameter is 400 μ m, and wherein 2 at center is light source, and peripheral 5 are collection fluorescence signal, Effective Raise phosphor collection efficient; 1# signal end optical fiber is 5 cores, and diameter is 400 μ m, and the fluorescence signal of collecting is coupled into optical filter and photosensitive tube, 2# signal end optical fiber also is 5 cores, diameter is 400 μ m, and the fluorescence signal of collecting is coupled into optical filter and photosensitive tube, and all fibre-optical splices are all selected the SMA905 adapter;
C) highlighted LED: adopting wavelength is the highlighted blue-ray LED of 473nm, and power is 350mW, the 5V power supply, and LED is encapsulated on the sexangle heat radiator, and driving circuit provides firm power output for LED;
D) signals collecting: after photosensitive tube is converted into current signal with light signal, is undertaken that signal amplifies and after filtering processes, send into the rear end and analyze, store and be wirelessly transmitted to Surveillance center by signal acquisition circuit, or direct display measurement value;
3) blue-green algae and turbidity detect sensor-based system
A) sensor probe: be divided into blue-green algae and pop one's head in and turbidity probe tip, the chlorophyll a probe is the stainless steel forward type, and light source shines directly into and excites blue-green algae to produce fluorescence in the water body, enters photosensitive tube by probe collection fluorescence and detects.Turbidity probe tip becomes 90 ° of structural design manufacturings for receiving light with incident light, directly insert water body to be measured to test;
B) source ends optical fiber is 4 cores, and fibre diameter is respectively the 1 100 μ m reference light in center and peripheral 3 400 μ m light sources; 1# detection probe end optical fiber is that 7 cores are the blue-green algae probe, and fibre diameter is 400 μ m, and wherein 1 at center is light source, and peripheral 6 are the collection fluorescence signal, but Effective Raise phosphor collection efficient; 2# detection probe end optical fiber is that 6 cores are turbidity probe tip, and fibre diameter is 400 μ m, and wherein 2 at center is light source, and peripheral 4 are the collection fluorescence signal, but Effective Raise phosphor collection efficient; 1# signal end optical fiber is 6 cores, and diameter is 400 μ m, and the fluorescence signal of collecting is coupled into optical filter and photosensitive tube, 2# signal end optical fiber also is 4 cores, diameter is 400 μ m, and the scattered light signal of collecting is coupled into optical filter and photosensitive tube, and all fibre-optical splices are all selected the SMA905 adapter;
C) highlighted LED: adopting wavelength is the highlighted blue-ray LED of 617nm, and power is 350mW, the 5V power supply, and LED is encapsulated on the sexangle heat radiator, and driving circuit provides firm power output for LED;
D) signals collecting: after photosensitive tube is converted into current signal with light signal, is undertaken that signal amplifies and after filtering processes, send into the rear end and analyze, store and be wirelessly transmitted to Surveillance center by signal acquisition circuit, or direct display measurement value.
4. by system claimed in claim 3, it is characterized in that:
1. in COD and the petroleum-type detection system: the one tunnel as the direct lead-in light fulgurite of intensity of light source reference light, measures the current signal of photoelectric tube as the reference value of the intensity of light source; Another road is transferred to the detection cell irradiation water body that inserts in the water body, ultraviolet light after collecting in water body organism etc. and absorb by signal optical fibre, conduction is 254nm through centre wavelength, half-peak breadth 30nm bandpass filter enters ultraviolet and strengthens responsive photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing; Enter bandpass filter after another route 254nm fluorescence excitation signal, centre wavelength 360nm are collected by signal optical fibre and photosensitive tube carries out opto-electronic conversion, gather the photosensitive tube current signal by the signal acquisition circuit version, signal through the single-chip microcomputer record, analyze and process;
2. in dissolved oxygen DO and the chlorophyll a detection system: the first via is measured the current signal of photoelectric tube as the reference value of the intensity of light source as the direct lead-in light fulgurite of intensity of light source reference light; The second the tunnel is transferred to the oxygen sensing film that inserts in the water body, it is 590nm fluorescence that ruthenium complex in the film is excited generation centre wavelength by 473nm blue light direct irradiation, fluorescence signal is 590nm by the signal optical fibre conduction through centre wavelength, half-peak breadth 30nm bandpass filter enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing; It is the fluorescence of 685nm that Third Road directly is transferred to the chlorophyll a generation centre wavelength that excites in the water body in the water body, fluorescence signal conducts through bandpass filter (centre wavelength 685nm by signal optical fibre, half-peak breadth 30nm) enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing;
3. blue-green algae and turbidity detect in the sensor-based system: the first via is measured the current signal of photoelectric tube as the reference value of the intensity of light source as the direct lead-in light fulgurite of intensity of light source reference light; The second the tunnel is transferred to sensor probe direct irradiation water body in the insertion water body, exciting blue-green algae to produce centre wavelength is 655nm fluorescence, fluorescence signal is 655nm by the signal optical fibre conduction through centre wavelength, half-peak breadth 10nm bandpass filter enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing; Third Road is transferred to and inserts sensor probe direct irradiation water body in the water body, collect scattered light in 90 ° of directions of incident light, conducting through centre wavelength by signal optical fibre is 617nm, half-peak breadth 15nm bandpass filter enters photosensitive tube, gather the photosensitive tube current signal by the signal acquisition circuit version, signal is through single-chip microcomputer record, analysis and processing.
5. by claim 2 or 3 described systems, it is characterized in that:
(1) 473nmLED and 617nmLED are available from sky, Shenzhen credit photoelectricity company limited, and model is respectively ball-top-473, ball-top-617; UV-LED is available from U.S. SETI company, and model is UVTOP255; All photosensitive tubes are available from German Silicon Sensor International AG company, and model is PC10-2TO5;
(2) the signal acquisition circuit plate is general voltage-stabilizing output circuit, and nA level current signal amplifies, binary channel, utmost point low noise;
(3) the 473/617nmLED drive circuit board is that general signal amplifies and treatment circuit, power consumption 350mW, operating voltage 3.7-4.2V, steady current output 350mA; The UV-LED drive circuit board is that general signal amplifies and treatment circuit, power consumption 20 μ W, operating voltage 3.7-4.2V, steady current output 20mA;
(4) described fiber optic materials is selected high grade quartz optical fiber, and the transmission wavelength scope is 200nm-1100nm.
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Application publication date: 20130925 |