CN109507303A - The adaptive program-controlled receiving and processing device and its method of electromagnetic acoustic echo-signal - Google Patents
The adaptive program-controlled receiving and processing device and its method of electromagnetic acoustic echo-signal Download PDFInfo
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- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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Abstract
The adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal, includes signal conditioning module, signal conditioning module is connected with signal sampling with processing module；Signal sampling is connected with processing module with processing chip；Processing chip is connected with PC machine；Processing chip is connected with human-computer interaction module；Processing chip is connected with voltage control signal module；Processing chip is connected with NAND FLASH；The following steps are included: 1) amplifying original signal waveform, feeding high-speed AD converter samples processing method；2) current demand signal peak-to-peak value is read, processing chip reduces current amplification gain multiple or increase current amplification gain multiple according to analog-digital conversion result；3) electromagnetic acoustic echo-signal amplitude is adjusted by gain transformations, is sent into analog-digital converter, while records each gain parameter, when display is carried out corresponding conversion to restore original waveform；Reception and digital processing can be carried out to electromagnetic acoustic echo-signal in the environment of high interference electromagnetism, ensure that the accuracy of measurement.
Description
Technical field
The present invention relates to nondestructive testing signal processing technology fields, and in particular to the digital electromagnetism with adaptation function
Ultrasonic signal receiving and processing device and its method.
Background technique
Current ultrasound detection is one of major technique of non-destructive testing, is widely used in line Quality Control, in-service sets
Among the safety detection of standby key components and parts.
Non-destructive testing is detected using piezoelectric ultrasonic substantially at present, and piezoelectric ultrasonic transducer needs the pressure using piezoelectric chip
Electrical effect emits and receives ultrasonic surface wave, it is desirable that and there is higher finish on test specimen surface, needs couplant etc.,
These disadvantages seriously limit piezoelectric supersonic detection in flaw detection, the application of detection field.With the progress of science and technology, in recent years
Electromagnetic acoustic is detected to have obtained very fast development and be applied in detection field.The advance of electromagnetic acoustic detection is embodied in electricity
Magnetic ultrasonic transducer (abbreviation EMAT), EMAT emit using galvanomagnetic-effect and receive ultrasonic surface wave, and energy conversion is tested
It is directly carried out in the skin depth of surface of test piece, does not need energy converter and couplant is contacted and do not needed with test specimen, overcome tradition
Contact problems in piezoelectric supersonic detection process.In engineering site is actually detected, the signal of electromagnet ultrasonic changer receiving end
Signal-to-noise ratio is low, and echo-signal is about tens millivolts, and the real-time of signal processing and the recovery requirement of waveform are higher.
In electromagnetic acoustic technology studies in China starting evening, the electromagnetic acoustic reception device volume occurred currently on the market is larger,
The processing of echo-signal is needed manually to switch shelves segmentation amplification according to signal magnitude, this processing method not only needs the hard of complexity
Part circuit also has certain lag simultaneously to echo-signal, and brings interference；Current electromagnetic acoustic reception device simultaneously, mostly not
Has the function that data communication is carried out based on high speed network.
Summary of the invention
To overcome above-mentioned the deficiencies in the prior art, the purpose of the present invention is to provide portable, digital electromagnetic acoustics
The adaptive program-controlled receiving and processing device of echo-signal, the arrangement achieves the adaptive amplifications of electromagnetic acoustic echo-signal, no
The only presentation original echoed signals of undistorted no phase shift, and electromagnetic ultrasonic signal progress digital processing, waveform can be shown and counted
According to network communication.Device has the characteristics that low in energy consumption, strong antijamming capability, fast response time simultaneously.Electromagnetic acoustic may be implemented
Echo-signal fast and accurately measures and processing.
To achieve the above object, the technical solution adopted by the present invention is that:
The adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal, includes signal conditioning module, signal condition
The output end of module is connected with signal sampling with processing module；The output end and processing chip phase of signal sampling and processing module
Even；Processing chip is connected by Ethernet RS485 with PC machine；The output end of processing chip is connected with human-computer interaction module；Processing
The output end of chip is connected with voltage control signal module；The output end of processing chip is connected with flash chip.
Electromagnetic acoustic echo-signal input terminal of the signal conditioning module as device receives electromagnetic acoustic original time
Wave signal, the waveform after conditioning is sent into signal sampling and processing module, the data after handling chip processing are stored in flash memory
Chip (NAND FLASH) is inner, and EEPROM power failure data does not lose storage chip (EEPROM) and is connected with processing chip, power down number
The reading that device powers on rear system default parameter is used for according to storage chip is not lost；
The signal conditioning module includes amplitude limiter circuit, pre-amplification circuit, programmable amplifying circuit, bandpass filtering electricity
Road, signal conditioning module is for making the signal limiter of electromagnetic acoustic echo, amplification, filtering for signal sampling and processing module
With；
The programmable amplifying circuit includes capacitor C10 and resistance R3, and capacitor C10 and resistance R3 access programming amplifying core
5 foot of feedback (FDBK) of the signal input part of piece U1, programming amplifying chip U1 (or claiming AD603) meets capacitor C12 and resistance R1
Second of gain amplification mode is constituted, the output end of level-one amplifying circuit is the input terminal of second amplifying circuit；
Capacitor C5, capacitor C11, capacitor C14 form filter circuit, and the signal of the programming amplifying chip U2 of resistance R4 access is defeated
Enter end, 5 foot of feedback of programming amplifying chip U2 meets capacitor C13 and resistance R2 and constitutes second of gain amplification mode.
The bandwidth-limited circuit includes resistance CR9, and resistance CR9 accesses the input terminal of signal, resistance CR7, resistance
CR10, resistance CR1, resistance CR3, resistance CR5 and capacitor C5, capacitor C7 composition single order Butterworth Sallen-Key structure, one
The output end of rank filter is the input terminal of second order filter；
Resistance CR8 accesses the input terminal of signal, resistance CR8, resistance CR11, resistance CR2, resistance CR4, resistance CR6 and electricity
Hold C6, capacitor C8 and forms second order Butterworth Sallen-Key structure.
The signal sampling and processing module includes attenuator circuit, analog to digital conversion circuit；Attenuator circuit is by signal condition
The signal decaying of module output, makes signal meet modulus conversion chip input voltage range, and is sent into analog to digital conversion circuit progress
Analog-to-digital conversion；The pulse signal that signal sampling and processing module combination processing chip provide realize high speed analog-to-digital conversion chip and
Row sampling, according to nyquist sampling theorem, electromagnetic acoustic echo original signal is restored；
The model STM32F767 of the processing chip 3；It handles chip, NAND FLASH, EEPROM and forms hardware
Platform；Processing chip interior is integrated with FPU, Julia collection and DSP instruction set, calculates for data and image is shown；
The human-computer interaction module is made of TFT touch screen, indicator light and key；For carrying out letter between device and user
Breath exchange, including original echoed signals are shown, practical hurt is shown, gain amplifier setting.
The signal conditioning module includes amplitude limiter circuit；Amplitude limiter circuit is connected with amplifying circuit in the same direction；Amplification electricity in the same direction
Road is connected with programmable amplifying circuit；Programmable amplifying circuit is connected with bandwidth-limited circuit；
The amplitude limiter circuit is the double limiting circuit of diode, capacitor composition, prevents outside electromagnetic interference and mutation
Voltage realizes input electromagnetic acoustic echo-signal between ± 0.7V range；
Impedance matching and same Xiang Fang great of the in-phase amplification circuit for high-frequency signal；
The programmable amplifying circuit realizes the amplification of signal 0-80dB gain controllable；
The bandwidth-limited circuit is that centre frequency is 2.5MHz, bandwidth B=1MHz Butterworth Sallen-Key
Structure active filter, for filtering out low frequency signal and higher hamonic wave interference signal in echo-signal；
The signal sampling and processing module includes attenuator circuit, analog-digital converter, and attenuator circuit will be for after filtering
Signal decay, it is ensured that signal is in analog-digital chip operating voltage range；Analog-digital converter is issued using processing chip
High-frequency pulse signal starting sampling, parallel data is stored in high-speed buffer FIFO.
The each circuit of signal conditioning module realizes logical order connection.
The adaptive reception process device of electromagnetic acoustic echo-signal of the invention realizes electromagnetic acoustic echo-signal not
It needs manually to select different signal amplification circuits according to the judgement of amplitude size, but directly according to echo-signal amplitude adjust automatically
Gain factor.
A kind of adaptive program-controlled reception processing of electromagnetic acoustic echo-signal, comprising the following steps:
S1: amplify original signal waveform using preset gain amplification factor in processing chip memory, be sent into high speed mould
Number converter is sampled；
S2: the input channel of signal sampling and processing module reads current demand signal peak-to-peak value, handles chip according to high speed mould
The analog-digital conversion result of number converter judges whether current peak-to-peak value is greater than 1.5VPP, reduces if signal is greater than 1.5VPP
Current amplification gain multiple increases current amplification gain multiple if signal is less than 0.5VPP；
S3: electromagnetic acoustic echo-signal is adjusted by the gain transformations of voltage control signal module, modulus is made it into and turns
When parallel operation, signal peak value is between 0.5V-1.5V, while NAND FLASH records each gain parameter, and when display will record
Gain parameter carry out corresponding conversion to restore original waveform.
The beneficial effects of the present invention are:
1) the device of the invention devises signal conditioning unit module, realizes amplitude limiter circuit, in-phase amplification circuit, program-controlled
Amplifying circuit, bandwidth-limited circuit are connected according to the same Xiang Fang great -programming amplifying of clipping-- bandpass filtering sequential logic respectively,
The clutter that electromagnetic acoustic echo-signal can not only effectively be filtered out can also remove higher hamonic wave interference, will stablize distortionless signal
It is sent into signal sampling and processing module, ensure that the undistorted amplification of electromagnetic acoustic original echoed signals.
2) gain constant of digital amendment current electromagnetic ultrasound echo signal may be implemented in the device of the invention, makes difference
The echo-signal of amplitude generates optimal echo effect by signal conditioning module, judges that amplitude size switches without using hardware
The mode of different stalls amplifies, and the gain constant that converts automatically in waveform display keeps waveform accurate, ensure that electromagnetic acoustic
The real-time and accuracy of echo-signal.
3) the device of the invention uses FreeRTOS operating system, and response speed is made faster to be provided simultaneously with RS485 and ether
Network interface, it then follows Modbus rtu and Modbus tcp agreement, engineering practical value with higher.
Adaptive reception process device of the present invention realizes electromagnetic acoustic echo-signal and is not required to manually according to amplitude
Size judgement selects different signal amplification circuits, but directly according to echo-signal amplitude adjust automatically gain factor.
The present invention, which is realized, analyzes quick, the undistorted capture of electromagnetic acoustic echo-signal with processing.Signal condition mould
Electromagnetic acoustic echo-signal input terminal of the block as device receives electromagnetic acoustic original echoed signals, and the waveform after conditioning is sent into
Signal sampling and processing module are based on STM32F767 hardware platform, realize signal frequency using operating system FreeRTOS
The electromagnetic acoustic echo-signal adaptively not gear shift sampling of 2.5MHz-10MHz, amplitude 1mv-700mv, ensure that echo-signal
Rapidity and stability.By STM32F767, treated that data are stored in NAND FLASH, and EEPROM is powered on for device
The reading of system default parameter afterwards.Device has Ethernet, RS485 communication interface, and Modbus TCP, Modbus may be implemented
RTU communication, while can use touch screen and checking respective waveforms, realize the convenience of unit engineering application.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structure charts of the adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal.
Fig. 2 (a) is the level-one amplification circuit diagram of programmable amplifying circuit of the present invention.
Fig. 2 (b) is the second amplifying circuit figure of programmable amplifying circuit of the present invention.
Fig. 3 (a) is the single order Butterworth Sallen-Key structural circuit figure of band pass filter circuit of the present invention.
Fig. 3 (b) is the second order Butterworth Sallen-Key structural circuit figure of band pass filter circuit of the present invention.
Fig. 4 is that signal conditioning module of the invention connects logic chart.
Fig. 5 is adaptive amplitude Processing Algorithm flow chart of the invention.
Fig. 6 is the original waveform using the actually measured electromagnetic acoustic echo-signal of the present invention.
Specific embodiment
Below in conjunction with drawings and examples, invention is further described in detail.
As shown in Figure 1, the adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal, includes signal conditioning module
1, the output end of signal conditioning module 1 is connected with signal sampling with processing module 2；The output end of signal sampling and processing module 2
It is connected with processing chip 3；Processing chip 3 is connected by Ethernet RS4854 with PC machine 5；Handle chip 3 output end with it is man-machine
Interactive module 6 is connected；The output end of processing chip 3 is connected with voltage control signal module 8；Handle output end and the sudden strain of a muscle of chip 3
Chip (NAND FLASH) 7 is deposited to be connected.
The model STM32F767 of the processing chip 3；It handles chip, NAND FLASH, EEPROM and forms hardware
Platform；Processing chip interior is integrated with FPU, Julia collection and DSP instruction set, calculates for data and image is shown；
STM32F767 hardware platform, NAND FLASH, EEPROM, Ethernet, RS485 interface, human-computer interaction module, FreeRTOS behaviour
Make system, realizes and quick, the undistorted capture of electromagnetic acoustic echo-signal is analyzed with processing.Signal conditioning module is as dress
The electromagnetic acoustic echo-signal input terminal set receives electromagnetic acoustic original echoed signals, and the waveform after conditioning is sent into signal sampling
With processing module, chip is handled based on STM32F767, signal frequency 2.5MHz- is realized using operating system FreeRTOS
The electromagnetic acoustic echo-signal adaptively not gear shift sampling of 10MHz, amplitude 1mv-700mv, ensure that the rapidity of echo-signal
And stability.By STM32F767, treated that data are stored in NAND FLASH, EEPROM powered on for device after be
The reading of system default parameters.Device has Ethernet, RS485 communication interface, and Modbus TCP, Modbus RTU may be implemented
Communication, while can use touch screen and checking respective waveforms, realize the convenience of unit engineering application.It realizes super to electromagnetism
Quick, undistorted capture and the processing of sound echo-signal are analyzed；
The signal conditioning module includes amplitude limiter circuit, pre-amplification circuit, programmable amplifying circuit, bandpass filtering electricity
Road, for using the signal limiter of electromagnetic acoustic echo, amplification, filtering for signal sampling and processing module；
The signal conditioning module includes amplitude limiter circuit, pre-amplification circuit, programmable amplifying circuit, bandpass filtering electricity
Road, for using the signal limiter of electromagnetic acoustic echo, amplification, filtering for signal sampling and processing module；
The signal sampling and processing module include attenuator circuit, analog to digital conversion circuit.In conjunction with main control chip STM32F767
The pulse signal of offer realizes the parallel sampling of high speed analog-to-digital conversion chip, according to nyquist sampling theorem, by electromagnetic acoustic
Echo original signal is restored；
The STM32F767 hardware platform includes master chip, NAND FLASH, EEPROM, and master chip is internally integrated
FPU, Julia collection and DSP instruction set calculate for data and image are shown；
The human-computer interaction module is used to carry out information interchange between device and user, including original echoed signals are shown
Show, practical hurt is shown, gain amplifier setting.
The amplitude limiter circuit of the signal conditioning module is the double limiting circuit of diode composition, to ensure in practical inspection
In survey, outside electromagnetic interference and mutation voltage are prevented, realizes input electromagnetic acoustic echo-signal between ± 0.7V range；Same phase
Impedance matching and same Xiang Fang great of the amplifying circuit for high-frequency signal；Programmable amplifying circuit realizes that signal 0-80dB gain controllable is put
Greatly；Bandwidth-limited circuit is used to filter out the low frequency signal and higher hamonic wave interference signal in echo-signal.
Attenuator circuit is for decaying filtered signal in the signal sampling and processing module, to ensure letter
Number in analog-digital chip operating voltage range；The high-frequency pulse signal starting that analog-digital converter is issued using STM32F767 is adopted
Parallel data is stored in high-speed buffer FIFO by sample.
In Fig. 2 (a), the signal input part of capacitor C10 and resistance R3 access programming amplifying chip U1, programming amplifying chip U1
5 foot of feedback (FDBK) of (or claiming AD603) meets capacitor C12 and resistance R1 and constitutes second of gain amplification mode, level-one amplification
The output end of circuit is the input terminal of second amplifying circuit.
1 foot (GPOS) of programming amplifying chip U1 meets DAC1, and 2 feet (GNEG) of programming amplifying chip U1 meet DAC2；It is program-controlled
3 feet (VINP) of amplification chip U1 meet capacitor C10 and resistance R3；4 feet of programming amplifying chip U1 are connected with GND, capacitor C12；
6 feet (VNEG) of programming amplifying chip U1 meet capacitor C8, capacitor 9, VCC-5；7 feet (VOUT) of programming amplifying chip U1 connect electricity
Hinder R1, OUT1；8 feet (VPOS) of programming amplifying chip U1 meet capacitor C3, VCC5, capacitor C1；Capacitor C3, capacitor C1 with
GND1 is connected.
In Fig. 2 (b), C5, capacitor C11, capacitor C14 form filter circuit, the programming amplifying chip U2's of resistance R4 access
Signal input part, 5 foot of feedback of programming amplifying chip U2 meet capacitor C13 and resistance R2 and constitute second of gain amplification mode.
1 foot (GPOS) of programming amplifying chip U2 meets DAC3, and 2 feet (GNEG) of programming amplifying chip U2 meet DAC4；It is program-controlled
3 feet (VINP) of amplification chip U2 meet capacitor C5, capacitor C11, capacitor C14 and resistance R4；4 feet of programming amplifying chip U2 with
GND, capacitor C13 are connected；6 feet (VNEG) of programming amplifying chip U2 meet capacitor C6, capacitor C7, VCC-5；Programming amplifying chip
7 feet (VOUT) connecting resistance R2, OUT2 of U2；8 feet (VPOS) of programming amplifying chip U2 meet capacitor C4, VCC5, capacitor C2；Capacitor
C4, capacitor C2 are connected with GND1.
Referring to Fig. 3 (a), the bandwidth-limited circuit includes resistance CR9, and resistance CR9 accesses the input terminal of signal, resistance
CR7, resistance CR10, resistance CR1, resistance CR3, resistance CR5 and capacitor C5, capacitor C7 form single order Butterworth Sallen-Key
The output end of structure, firstorder filter is the input terminal of second order filter；
2 feet (INPUT-) of filtering chip U1 are connected with resistance CR5, resistance CR3；3 feet (INPUT+) of filtering chip U1
It is connected with resistance CR10, capacitor C5；4 feet (- VS) of filtering chip U1 are connected with VCC-5, capacitor C12, capacitor C10；Capacitor
C12, capacitor C10 are also connected with GND；6 feet (OUT) of filtering chip U1 are connected with resistance CR1, resistance CR3, OUT1；Filter core
7 feet (+VS), 8 feet (DIS) of piece U1 are connected with VCC5, capacitor C1, capacitor C3；Capacitor C1, capacitor C3 are connected with GNG.
In Fig. 3 (b), resistance CR8 accesses the input terminal of signal, resistance CR8, resistance CR11, resistance CR2, resistance CR4, electricity
It hinders CR6 and capacitor C6, capacitor C8 and forms second order Butterworth Sallen-Key structure.
2 feet (INPUT-) of filtering chip U2 are connected with resistance CR2, resistance CR4；3 feet (INPUT+) of filtering chip U2
It is connected with resistance CR11, capacitor C6；4 feet (- VS) of filtering chip U1 are connected with VCC-5, capacitor C12, capacitor C10；Capacitor
C12, capacitor C10 are also connected with GND；6 feet (OUT) of filtering chip U1 are connected with resistance CR4, resistance CR2, OUT2；Filter core
7 feet (+VS), 8 feet (DIS) of piece U2 are connected with VCC5, capacitor C2, capacitor C4；Capacitor C2, capacitor C4 are connected with GNG.
As shown in figure 4, connecting logic chart for signal conditioning module of the invention, electromagnetic acoustic echo-signal is as input letter
Number, signal enters amplitude limiter circuit, and (amplitude limiter circuit and in-phase amplification circuit are the prior art, programmable amplifying circuit and bandpass filter
To design circuit) it is limited, in-phase amplification circuit realizes impedance matching function, after programmable amplifying circuit will match impedance
Signal carries out programmable way and controls gain amplifier multiple, realizes small-signal amplification, bandwidth-limited circuit is by amplified letter
It number is filtered, filters out low frequency wave and higher hamonic wave；Four circuits successively sequentially cooperate, and can not only effectively amplify original signal,
And higher hamonic wave and ringing are effectively filtered out in high frequency signals.
As shown in Figure 5,6, adaptive amplitude Processing Algorithm flow chart of the invention, realizes electromagnetic acoustic echo-signal not
It needs manually to select different signal amplification circuits according to the judgement of amplitude size, but directly according to echo-signal amplitude adjust automatically
Gain factor.Adaptive reception method, comprising the following steps:
S1: amplify original signal waveform using preset gain amplification factor in processing chip memory, be sent into high speed mould
Number converter is sampled；
S2: the input channel of signal sampling and processing module reads current demand signal peak-to-peak value, handles chip according to high speed mould
The analog-digital conversion result of number converter judges whether current peak-to-peak value is greater than 1.5VPP, reduces if signal is greater than 1.5VPP
Current amplification gain multiple increases current amplification gain multiple if signal is less than 0.5VPP；
S3: electromagnetic acoustic echo-signal is adjusted by the gain transformations of voltage control signal module, modulus is made it into and turns
When parallel operation, signal peak value is between 0.5V-1.5V, while NAND FLASH records each gain parameter, and when display will record
Gain parameter carry out corresponding conversion to restore original waveform.
Therefore, which realizes echo-signal and adaptively amplifies, which can be real
It now reduces hardware circuit and selects brought time loss.By it was verified that the algorithm realizes 1mv-700mv echo-signal
Self-adapting type amplification, echo-signal amplitude then reduce greatly gain amplifier, and echo-signal amplitude is small, improves gain amplifier, simultaneously
Being carried out corresponding conversion in waveform display not only can guarantee the accuracy of data to restore original waveform, but also improve in real time
Responsiveness, engineering practical value with higher.
In conclusion the adaptive program-controlled receiving and processing device of the invention based on electromagnetic acoustic echo-signal, first will
Electromagnetic acoustic echo-signal is sent into signal conditioning module, will amplify filtered signal and be sent into signal sampling and processing module progress
Analysis, processing and calculating, human-computer interaction module are used to show the information exchange between devices and user such as measured waveform, while real
The functions such as existing waveform recording, data communication.
The above is present pre-ferred embodiments, for the ordinary skill in the art, according to the present invention
Introduction, in the case where not departing from the principle of the present invention and spirit, changes, modifications, replacement and change that embodiment is carried out
Type is still fallen within protection scope of the present invention.
Claims (7)
1. the adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal includes signal conditioning module (1), signal condition
The output end of module (1) is connected with signal sampling with processing module (2)；The output end and place of signal sampling and processing module (2)
Chip (3) are managed to be connected；Processing chip (3) is connected by Ethernet RS485 (4) with PC machine (5)；Handle the output end of chip (3)
It is connected with human-computer interaction module (6)；The output end of processing chip (3) is connected with voltage control signal module (8)；Handle chip
(3) output end is connected with flash chip (7).
2. the adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal according to claim 1, which is characterized in that
Electromagnetic acoustic echo-signal input terminal of the signal conditioning module as device receives electromagnetic acoustic original echoed signals,
Waveform after conditioning is sent into signal sampling and processing module, the data after handling chip processing are stored in flash chip,
Power failure data does not lose storage chip and is connected with processing chip, and power failure data does not lose storage chip and powers on rear system for device
The reading of default parameters；
The signal conditioning module includes amplitude limiter circuit, pre-amplification circuit, programmable amplifying circuit, bandwidth-limited circuit, letter
Number conditioning module is used for the signal limiter of electromagnetic acoustic echo, amplification, filtering for signal sampling and processing module use；
The signal sampling and processing module includes attenuator circuit, analog to digital conversion circuit；Attenuator circuit is by signal conditioning module
The signal of output is decayed, and signal is made to meet modulus conversion chip input voltage range, and is sent into analog to digital conversion circuit and is carried out modulus
Conversion；Signal sampling realizes adopting parallel for high speed analog-to-digital conversion chip with the pulse signal that processing module combination processing chip provides
Sample restores electromagnetic acoustic echo original signal according to nyquist sampling theorem；
The model STM32F767 of the processing chip (3)；Processing chip, flash chip, power failure data do not lose storage core
Piece forms hardware platform；Processing chip interior is integrated with FPU, Julia collection and DSP instruction set, calculates for data and image is aobvious
Show；
The human-computer interaction module is made of TFT touch screen, indicator light and key；For carrying out information friendship between device and user
Stream, including original echoed signals are shown, practical hurt is shown, gain amplifier setting.
3. the adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal according to claim 1, which is characterized in that
The signal conditioning module includes amplitude limiter circuit；Amplitude limiter circuit is connected with amplifying circuit in the same direction；Amplifying circuit in the same direction with it is program-controlled
Amplifying circuit is connected；Programmable amplifying circuit is connected with bandwidth-limited circuit；
The amplitude limiter circuit is the double limiting circuit of diode, capacitor composition, prevents outside electromagnetic interference and mutation voltage,
Realize input electromagnetic acoustic echo-signal between ± 0.7V range；
Impedance matching and same Xiang Fang great of the in-phase amplification circuit for high-frequency signal；
The programmable amplifying circuit realizes the amplification of signal 0-80dB gain controllable；
The bandwidth-limited circuit is that centre frequency is 2.5MHz, bandwidth B=1MHz Butterworth Sallen-Key structure
Active filter, for filtering out low frequency signal and higher hamonic wave interference signal in echo-signal.
4. the adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal according to claim 1, which is characterized in that
The programmable amplifying circuit includes capacitor C10 and resistance R3, the signal of capacitor C10 and resistance R3 access programming amplifying chip U1
Input terminal, 5 foot of feedback of programming amplifying chip U1 meet capacitor C12 and resistance R1 and constitute second of gain amplification mode, and level-one is put
The output end of big circuit is the input terminal of second amplifying circuit；
Capacitor C5, capacitor C11, capacitor C14 form filter circuit, the signal input of the programming amplifying chip U2 of resistance R4 access
End, 5 foot of feedback of programming amplifying chip U2 meet capacitor C13 and resistance R2 and constitute second of gain amplification mode.
5. the adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal according to claim 1, which is characterized in that
The bandwidth-limited circuit includes resistance CR9, and resistance CR9 accesses the input terminal of signal, resistance CR7, resistance CR10, resistance
CR1, resistance CR3, resistance CR5 and capacitor C5, capacitor C7 form single order Butterworth Sallen-Key structure, firstorder filter
Output end is the input terminal of second order filter；
The input terminal of resistance CR8 access signal, resistance CR8, resistance CR11, resistance CR2, resistance CR4, resistance CR6 and capacitor C6,
Capacitor C8 forms second order Butterworth Sallen-Key structure.
6. the adaptive program-controlled receiving and processing device of electromagnetic acoustic echo-signal according to claim 1, which is characterized in that
The signal sampling and processing module include attenuator circuit, analog-digital converter, attenuator circuit be used for by filtered signal into
Row decaying, it is ensured that signal is in analog-digital chip operating voltage range；The high-frequency impulse that analog-digital converter is issued using processing chip
Signal enabling sampling, parallel data is stored in high-speed buffer FIFO.
7. the adaptive program-controlled receiving handling method of electromagnetic acoustic echo-signal, which is characterized in that
The following steps are included:
S1: amplify original signal waveform using preset gain amplification factor in processing chip memory, be sent into high speed analog-digital conversion and turn
Parallel operation is sampled；
S2: the input channel of signal sampling and processing module reads current demand signal peak-to-peak value, and processing chip turns according to high speed analog-digital conversion
The analog-digital conversion result of parallel operation judges whether current peak-to-peak value is greater than 1.5VPP, reduces if signal is greater than 1.5VPP and currently puts
Large gain multiple increases current amplification gain multiple if signal is less than 0.5VPP；
S3: electromagnetic acoustic echo-signal is adjusted by the gain transformations of voltage control signal module, makes it into analog-digital converter
When, signal peak value is between 0.5V-1.5V, while NAND FLASH records each gain parameter, by the increasing of record when display
Beneficial parameter carries out corresponding conversion to restore original waveform.
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| CN116800212A (en) * | 2023-08-23 | 2023-09-22 | 中北大学 | Gain-adjustable non-contact ultrasonic receiving signal processing circuit with clamping function |
| CN116800212B (en) * | 2023-08-23 | 2023-11-03 | 中北大学 | Gain-adjustable non-contact ultrasonic receiving signal processing circuit with clamping function |
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