CN101354240A - Micro nano-scale fiber high precision measuring system based on micro-optical - Google Patents
Micro nano-scale fiber high precision measuring system based on micro-optical Download PDFInfo
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- CN101354240A CN101354240A CNA2008101244188A CN200810124418A CN101354240A CN 101354240 A CN101354240 A CN 101354240A CN A2008101244188 A CNA2008101244188 A CN A2008101244188A CN 200810124418 A CN200810124418 A CN 200810124418A CN 101354240 A CN101354240 A CN 101354240A
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Abstract
The invention discloses a high-accuracy measuring system of novel micro-nano scale fiber based on optical microscopy, which is composed of a micro-optical amplification system, a photoelectric conversion device and a computer aided measuring system. The measuring system of the invention is characterized in that: an annular LED is adopted as a system light source for irradiating on a sample to be measured, and after reflected light passes through a light filter adaptive to the system, a fiber image is amplified by the micro-optical amplification system to form a microimage of high quality; through a CCD, an optical signal is transferred to an electrical signal and through an analog-digital converter, a digital signal is transmitted into a computer host; a matching image measuring system is used for pretreatment and measurement of a collected fiber digital image; finally, fiber morphological parameters obtained by the measurement are displayed. The system of the invention can collect the microimage of high quality and has the advantages of high measuring accuracy, good reliability, low cost, wide measurement range and the like.
Description
1 technical field
The present invention relates to a kind of novel fibre image collection, processing and measuring system, be particularly related to the microoptic image high-quality acquisition system that a kind of suitable micro nano-scale fiber is measured, relate to a kind of measurement range very wide microoptic graphical analysis and disposal system simultaneously.
2 background technologies
At present the basic skills that detects of fibre fineness mainly contains fiber micro projection, optical fiber diameter analytic approach (micro-image method) and profile scan method, and characteristics become the most frequently used fiber detection method now and optics shooting and fast image processing method are because its processing speed is fast, simple to operate etc.The ultimate principle of image method is to utilize micro optical system to gather the optical microscopic image of fiber, is converted to digital picture through CCD, image pick-up card, utilizes the fineness of computer picture auxiliary process commercial measurement fiber at last.At present fibre image collection and the disposal system of using adopts commonsense method to gather the reflection or the transmission image of fiber, and this image is subject to the influence of impurity on the selection of background and the fiber, problems such as picture contrast is strong, fiber edge is unintelligible occur.For large scale (hundred micron orders) fiber, this class problem can suitably solve by later stage computer picture preprocess method, but for small scale (micro/nano level) fiber, only rely on image pre-processing method can not effectively solve the not fogging clear measuring error of bringing, directly influenced the precision of system's detection fibers diameter.Fibre diameter is to determine one of fiber quality and the most important parameter of use value, and high-quality fibre diameter generally is on the order of magnitude of several microns even nanometer.For this superfine fibre, present measuring system of picture can not satisfy high-precision requirement.Therefore, be badly in need of a kind of novel fiber high precision measuring system of development, to solve existing problem.
3 summary of the invention
First problem that the present invention will solve just provides the fiber optics image capturing system and the method for designing of a kind of high definition, high-contrast, to improve the precision that later image is measured greatly.Second problem that the present invention will solve just provides a professional and complete software that be fit to measure the fibre morphology parameter, makes that the total system interface is more succinct, operation is simpler.
In view of the above-mentioned problem that needs solution, the objective of the invention is to develop a kind of high precision, be fit to microoptic image acquisition and disposal system that micro nano-scale fiber detects.Improve the precision of systematic survey, it primarily is the sharpness problems that solves original image, the present invention is before images acquired, earlier different fibers are carried out spectral analysis, the adaptive suitable light filter of optics essence according to fiber, be added in the micro optical system, solved problems such as the fibre image contrast is not strong, blur margin is clear effectively, and then improved the precision that later image is measured.Characteristics such as the system of the present invention's development has precision height, good reliability, cost is low, processing speed is fast, sensing range is wide.
High precision fiber image acquisition of the present invention, processing and measuring system (Fig. 1) adopt annular LED to be radiated on the testing sample as system source, and reflected light enters the microoptic amplification system and carries out the optical imagery amplification through the adaptive light filter of system; Gather light signal and light signal be converted to electric signal through signals collecting and converting system by photoelectric converting device, by the analog-to-digital conversion device with digital data transmission to main frame; Use supporting measuring system of picture the fiber microscopic digital image that collects is carried out image pre-service and image measurement; Show the fibre morphology parameter that measures at last.
In order to reach above-mentioned goal of the invention, first technical scheme of the present invention is a design fiber optics image capturing system, so that collect the high quality fibers image, this method comprises the following steps:
First step: fiber microoptic image acquisition step, it is characterized in that, based on the microoptic imaging technique, select suitable light source for use, adaptive suitable optical device, clear to obtain, high-quality fiber optics image, thus improve measuring accuracy; Specifically comprise the following steps:
Step 1: adopt the LED of Stability Analysis of Structures, low energy consumption, the ring-like LED group that several even distribution LED are constituted is as the light source of system, and each LED all exposes to sample at a certain angle; But adopt automatic focusing micrometric displacement sample stage in this step, utilize DSP drive stepping motor (Fig. 2), drive sample stage and move, realize auto-focus function sample;
Step 2: adaptive suitable optical filter, light source irradiation are on fiber sample, behind the emission light process light filter filtering parasitic light, as the light signal input of microoptic amplification system; In this step, by fiber being carried out characteristic spectrum analysis and research, according to the spectral characteristic of various different fibrous matters, adaptive corresponding light filter is used with the system miscellaneous part and can realizes the high-definition image collection;
Step 3: the output signal of step 2 is input in the microoptic amplification system, signal is carried out optics amplify; Core component is the microoptic image-forming module in this step, the optical imagery module partly is made of optical lens, light source, imaging optical path, complementary physical construction etc., the microoptic image must be considered its picture element, sharpness, contrast and handlability, relates generally to following Several Factors: image magnification ratio, imaging space, picture quality;
Fig. 3 is the micro-imaging light path, and its formula is as follows:
Δ---imaging space
D---entrance pupil diameter
U---object distance
β---magnification
Z---CCD pixel yardstick
F---focal length
Owing to adopt structure integrated level height, microoptic amplifying device that volume is small, be specially adapted to in-site measurement in this step.
Second step: the opto-electronic conversion step, adopt high-resolution CCD with the amplification of first step output after optical signalling be converted to electric signal, transfer to computing machine after by modulus switching device electric signal being converted into digital signal;
Second technical scheme of the present invention is design and works out special fibre image and handle and Survey Software two steps of pre-service of software design partial image and image measurement.
First step (image pre-service):
Fig. 4 is the process flow diagram of Preprocessing Algorithm, it in the computing machine is the coloured image of fiber that micro image collection and conversion system transfer to, the filtering template that needs that at first coloured image is converted to the gray level image that is fit to software processes and select to be fit to the image inverse, is then carried out filtering to gray level image, remove noise spot in the image, image is carried out binary conversion treatment, and fibrous inside filled processing, bright spot in the fiber is filled, at last image carried out rim detection and edge tracking processing, obtain being fit to the image of image measurement;
Second step (image measurement algorithm):
Fig. 5 is the process flow diagram of image measurement algorithm, at first adopt Level Set Method to extract the center line of fiber, use chain code technology and follow the tracks of the center line that extracts, in center line, determine to calculate starting point and determine next calculation level, extract the vertical line of calculation level place center line successively, calculate the diameter of this some place fiber and store, calculate the mean diameter that finishes back this fiber of statistics every a fixed step size.
Fibre image collection, processing and the measuring system that the present invention relates to are gathered fibre image according to the optics essence of fiber, because the fibre image quality height that collects of micro optical system, make the precision of Flame Image Process in later stage also be greatly improved.System of the present invention is applicable to the measurement of animal origin, vegetable fibre, glass fibre and human body tubulose micro-structure etc., the measurement that is particularly suitable for measuring the miniature scale fiber, and range of application is very extensive.System of the present invention is furnished with the special image processing software of establishment voluntarily, and software operation is simple, powerful, measurement range is wide, precision is high.
4 description of drawings
Fig. 1 system chart
The micro-index path of Fig. 2
Fig. 3 DSP driving circuit figure
Fig. 4 image pretreatment process figure
Fig. 5 image measurement process flow diagram
Fig. 6 system construction drawing
Fig. 7 software kit surface chart
The pre-service of Fig. 8 image is figure as a result
Fig. 9 software measurement is displayed map as a result
5 embodiments
Examples of implementation: the fiber with measurement plant-cotton is an example, be illustrated in figure 6 as the system construction drawing of embodiment, this system is mainly by forming with the lower part: light source, objective table, microoptic amplification system, image acquisition converting system (CCD), computing machine.Adopt the light source of ring-like LED group as system, light source from directly over shine on the vegetable fibre sample, the reflected light of vegetable fibre is through importing the optical lens of micro optical system into behind the adaptive light filter filtering parasitic light; Being converted to electric signal by the optical signalling of CCD after with micro-amplification, is that digital signal is sent in the main frame through modulus switching device with electrical signal conversion then;
According to the imaging situation, utilize the DSP drive stepping motor, drive the micrometric displacement objective table and move, make micro-image automatic focus, principle of work shown in Figure 2; Gating pulse is imported by pulse input end, the frequency multiplication magnetizing exciter is used for carrying out pulse distribution, produce four phase voltages, in certain phase (as a phase) when being output as high level, the driving triode conducting of this phase is exaggerated at this phase current of collector of triode, is flow through by big electric current in this phase winding in the stepper motor, by constantly covert, stepper motor can continue to rotate;
By homemade supporting image processing software digital picture is carried out Flame Image Process and calculating at last, on display, show the fibre diameter that draws as calculated.
The displayed map of actual measurement fiber micro-image in software kit that Fig. 7 obtains for the micro image collection system acquisition.Fibre image shown in the figure is compared with the fibre image that commonsense method collects, because the noise that impurity produces on the background significantly reduces, the contrast of image and the sharpness of fiber edge and continuity all are significantly improved in the image.The minimizing of ground unrest and the enhancing of picture contrast have made things convenient for the computer picture pre-service in later stage, and the sharpness of fiber edge and successional improvement have improved the precision that fibre diameter is measured effectively.Fig. 8 is the micro-image pre-service of using supporting image processing software figure as a result, and Fig. 9 is software demonstration measurement result figure.
Claims (5)
1, a kind of micro nano-scale fiber high precision measuring system based on microoptic is characterized in that, comprises the following steps:
First step: fiber microoptic image acquisition step is characterized in that based on the microoptic imaging technique, select suitable light source and adaptive suitable optical device for use, clear to obtain, high-quality fiber optics image improves measuring accuracy; Specifically comprise the following steps:
Step 1: adopt the LED of Stability Analysis of Structures, low energy consumption, the ring-like LED group that several equally distributed LED are constituted is as the light source of system, and each LED shines the sample on the objective table at a certain angle;
Step 2: adaptive suitable optical filter, light source irradiation are on fiber sample, behind the emission light process light filter filtering parasitic light, as the light signal input of microoptic amplification system;
Step 3: the output signal of step 2 is input in the microoptic amplification system, will carries out optics to sample and amplify;
Second step: the opto-electronic conversion step, adopt high resolution CCD that the optical signalling of first step output is converted to electric signal, and electric signal is converted into digital signal by modulus switching device, the fiber data image signal is transferred to computing machine;
Third step: the computer picture measuring process, the appliance computer image processing techniques, the fiber data image signal that second step is exported carries out the image pre-service, utilizes the diameter of specific algorithm computation fiber; Specifically comprise the following steps:
Step 1: microscopic digital image pre-service, original image is converted to gray level image, and the image filtering template that select to be fit to the image inverse, is then carried out filtering to gray level image, remove noise spot in the image, image is carried out binaryzation, and fibre image filled processing, the bright spot in the fiber is filled, at last image carried out the accurate edge that rim detection obtains fiber;
Step 2: fibre diameter is measured, adopt Level Set Method to extract the center line of fiber, and follow the tracks of the fibrillar center line with chain code technology, in center line, determine to calculate starting point and determine next calculation level, extract the vertical line of calculation level place center line successively, calculate the diameter of this some place fiber and store, calculate the mean diameter that finishes back this fiber of statistics every a fixed step size.
2, the micro nano-scale fiber high precision measuring system based on microoptic according to claim 1 is characterized in that, microoptic amplifying device structure integrated level height, and volume is small, is specially adapted to field condition and measures, and has adaptable characteristics.
3, the micro nano-scale fiber high precision measuring system based on microoptic according to claim 1, it is characterized in that system's scope of application is extensive, system is applicable to the detection of animal origin, vegetable fibre, glass fibre and the human body tubulose micro-structure etc. in fields such as animal husbandry, textile industry, communication and medicine equipment.
4, the micro nano-scale fiber high precision measuring system based on microoptic according to claim 1 is characterized in that, main frame control DSP drive stepping motor drives the micrometric displacement objective table and moves, and makes microscopic system automatic focus.
5, the micro nano-scale fiber high precision measuring system based on microoptic according to claim 1 is characterized in that, image processing software can not only be measured fibre diameter, also has the function of measuring other morphological parameters of fiber.
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| CN101806583A (en) * | 2010-03-04 | 2010-08-18 | 上海大学 | Microscopic image-based fiber fineness measurement method |
| CN101532958B (en) * | 2009-04-28 | 2010-08-18 | 南京航空航天大学 | Method and system for measuring dry rubber content in concentrated latex based on photoelectric sensor |
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| CN2063536U (en) * | 1989-12-20 | 1990-10-10 | 丹东化学纤维工业公司 | Stereo-microscope for detecting spinning plate for synthetic fibre |
| CN1117964C (en) * | 2000-03-31 | 2003-08-13 | 清华大学 | Method and special microscopic device for measuring size of fibre |
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- 2008-07-15 CN CN2008101244188A patent/CN101354240B/en not_active Expired - Fee Related
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| CN101532958B (en) * | 2009-04-28 | 2010-08-18 | 南京航空航天大学 | Method and system for measuring dry rubber content in concentrated latex based on photoelectric sensor |
| CN101806583A (en) * | 2010-03-04 | 2010-08-18 | 上海大学 | Microscopic image-based fiber fineness measurement method |
| CN101806583B (en) * | 2010-03-04 | 2012-03-28 | 上海大学 | Microscopic image-based fiber fineness measurement method |
| CN102457658A (en) * | 2010-10-19 | 2012-05-16 | 上海阳山材料科技有限公司 | X-ray utilization-based PCB board of CMOS camera |
| CN102410811A (en) * | 2011-07-27 | 2012-04-11 | 北京理工大学 | Method and system for measuring parameters of bent pipe |
| CN102506756A (en) * | 2011-11-16 | 2012-06-20 | 重庆国际复合材料有限公司 | Method for representing cross section appearance and dimensions of glass fibre or basalt fibre |
| CN102589453A (en) * | 2011-12-16 | 2012-07-18 | 中国计量学院 | External diameter images measuring device for axial work pieces and measuring method thereof |
| CN106018150A (en) * | 2015-07-15 | 2016-10-12 | 中国石油大学(华东) | Using method of high-speed cutting deformation field transient measurement device |
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| CN106091955A (en) * | 2016-04-21 | 2016-11-09 | 克拉玛依市白碱滩区林牧生态研究院 | A kind of animal fiber fineness method for quick |
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| CN107289866A (en) * | 2017-06-01 | 2017-10-24 | 上海理工大学 | The method of multiangular measurement short carbon nanometer tube diameter and length |
| CN109282748A (en) * | 2018-11-12 | 2019-01-29 | 苏州经贸职业技术学院 | A kind of photoelectric precision detection system of embedded technology |
| CN110672303A (en) * | 2019-10-31 | 2020-01-10 | 中国电子科技集团公司第四十一研究所 | Optical fiber end face geometric parameter measuring device and method based on annular LED illumination |
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