CN107478603A - A kind of Portable non-contact laser alcohol measures device and method - Google Patents
A kind of Portable non-contact laser alcohol measures device and method Download PDFInfo
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- CN107478603A CN107478603A CN201710930727.3A CN201710930727A CN107478603A CN 107478603 A CN107478603 A CN 107478603A CN 201710930727 A CN201710930727 A CN 201710930727A CN 107478603 A CN107478603 A CN 107478603A
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 75
- 238000005259 measurement Methods 0.000 claims abstract description 55
- 238000000605 extraction Methods 0.000 claims abstract description 39
- 230000003287 optical effect Effects 0.000 claims abstract description 36
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 claims abstract description 34
- 230000003321 amplification Effects 0.000 claims abstract description 31
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 31
- 239000004065 semiconductor Substances 0.000 claims abstract description 29
- 238000011088 calibration curve Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 18
- 230000035945 sensitivity Effects 0.000 claims description 18
- 238000013500 data storage Methods 0.000 claims description 15
- 239000000284 extract Substances 0.000 claims description 9
- 230000004313 glare Effects 0.000 claims description 7
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 230000001629 suppression Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 230000000280 vitalizing effect Effects 0.000 claims description 4
- 230000005622 photoelectricity Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 11
- 238000007689 inspection Methods 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 206010039203 Road traffic accident Diseases 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Abstract
The present invention relates to a kind of Portable non-contact laser alcohol to measure device and method.The device includes DSP process circuits, TDLAS drivings and modulation circuit, and semiconductor laser, optical system, photodetector, low noise pre-amplification circuit, pole weak signal extraction circuit and instrument set input and data output display screen.The measuring method of the measurement apparatus is specific as follows：Comprise the concrete steps that：1) fitting of calibration curve；2) input of measurement parameter；3) shoot laser is excited and launched；4) reception of heliogram；5) measurement of vehicle alcohol Gas Molecular Density to be measured；6) display and alarm of alcohol gas molecular concentration；Quick, the accurate measurement to the alcohol molecule content inside road vehicular traffic are realized by the present invention.
Description
Technical field
The invention belongs to photodetection field, is related to a kind of Portable non-contact laser alcohol measurement device and method.
Background technology
China is the most country of world population, and the country that popularity of wine is most, therefore China belongs to and driven after drinking
Sail Frequent Accidents life country.According to statistics, China is because the traffic accident probability for generation of driving when intoxicated is non-probability of happening of driving when intoxicated
27 times, and every three traffic accidents of driving when intoxicated just have a people death, China is because of murderous number of driving when intoxicated
Occupy first place in the world within continuous 20 years.Therefore, traffic administration department in China's never loosens to drive when intoxicated (drunk driving and drunk driving)
Inspection.But as the rapid development of China's economy, the quantity of personal family's purchase vehicle are being continuously increased, China is closely several
Individual over year possesses the quantity growth that vehicle is always maintained at being more than annual 20000000, this law enforcement to traffic administration department
Capability Requirement further improves.
For the drunk driving detecting instrument quickly enforced the law currently used for traffic police scene mainly based on breathing detection, main Types have combustion
Expect cell type, semi-conductor type and colorimetric method type.But these products there is some shortcomings, mainly there is the following aspects：
1st, feulcell prototype wine inspection equipment belongs to electrochemical reaction, this although such product small volume, being easy to carry
Equipment is present than more serious time drift and temperature drift, it is necessary to regular calibration；
2nd, semi-conductor type wine inspection equipment belongs to physical reactions, and the sensitivity of such product is higher compared with feulcell prototype,
But using when need to preheat, power consumption is larger, less stable, the general work life-span be less than 2 years；
3rd, colorimetric determination instrument belongs to chemical reaction, and operation is fairly simple, but such product is easily by things such as formaldehyde, methanol
The influence of matter, accuracy of detection be not high.
It is currently used to drive when intoxicated rapid detection apparatus when in use, in addition to it above-mentioned each shortcoming and defect be present,
The defects of also being shared in the presence of some, mainly have it is following some：
(1) detection efficiency is relatively low
It is required to traffic police personnel and blocks vehicle stop, then needs driver with sharing mouth alignment detecting instrument air blowing side
It can complete to check, therefore detection efficiency is than relatively low.
(2) congestion in road is caused
When checking, if checking passing each vehicle, then serious congestion in road may be caused；If hand over
Alert law enfrocement official is inspected by random samples at random to vehicular traffic, then the possibility of missing inspection be present.
(3) safe and healthy hidden danger
In actual use, it is necessary to which driver carries out air blowing inspection with mouth alignment detecting instrument, if changing air inlet not in time
Mouth, then safe and healthy hidden danger be present.
The content of the invention
In order to solve deficiency and limitation present in prior art products in technical background, realize in road vehicular traffic
Quick, the accurate measurement of the alcohol molecule content in portion, the present invention proposes a kind of TDLAS that is based on (can the suction of harmony semiconductor laser
Receive spectrum) principle detected to determine illuminated vehicle to the pole weak laser signal gone out after laser irradiates from automobile internal reflection
The Portable non-contact laser alcohol measurement device and method of internal alcohol gas molecular concentration, so that normal vehicle operation
In the case of complete to the measure of vehicle interior alcohol molecule concentration.
The technical solution that the present invention uses is as follows：
The invention provides a kind of Portable non-contact laser alcohol measurement apparatus, its basic structure includes DSP processing electricity
Road, TDLAS drivings and modulation circuit, semiconductor laser, optical system, photodetector, low noise pre-amplification circuit, pole
Weak signal extracts circuit and instrument sets input and data output display screen；
DSP process circuits set and inputted with TDLAS drivings and modulation circuit, pole weak signal extraction circuit and instrument respectively
And data output display screen electrical connection；
TDLAS drives and modulation circuit vitalizing semiconductor swashs device light and sends shoot laser, and shoot laser passes through optical system
After be pointed into vehicle interior to be measured；Optical system receives the weak laser signal of vehicle interior reflection to be measured and converged at
On photodetector target surface；
Photodetector extracts circuit with pole weak signal by low noise pre-amplification circuit and electrically connected.
In the embodiment of another kind optimization, in addition to low-light (level) high sensitivity camera device；The low-light (level) is highly sensitive
Degree camera device electrically connects the image for shooting vehicle to be measured with DSP process circuits；Low-light (level) high sensitivity camera device
There is the signal to noise ratio not less than 30dB under conditions of 0.003Lux@F1.2.
In order to increase the trackability of follow-up data, the device also includes data storage circuitry；The data storage circuitry
Electrically connected with DSP data processing circuits.
Specifically, the optical system uses parabola optical collector form.
Specifically, the optical system and the farthest horizontal range of vehicle to be measured are 100m.
Specifically, the low noise pre-amplification circuit is in gain 106Under the conditions of noise as little as 1mVrmsBelow.
It is as follows based on the structure of above-mentioned Portable non-contact laser alcohol measurement apparatus, its specific step：
1) fitting of calibration curve
It is defeated by gathering pole weak signal extraction circuit by the alcohol gas of harmony semiconductor laser irradiation various concentrations
The unlike signal amplitude gone out establishes functional relation and fitted calibration curve, and function and calibration curve are stored in into DSP process circuits
In；
2) input of measurement parameter；
Measurement parameter is inputted to instrument input and data output display screen are set, instrument sets input and data output to show
Measurement parameter is transferred to DSP process circuits by display screen；The measurement parameter includes measuring distance and alcohol molecule concentration warning level
Value；
3) shoot laser is excited and launched；
3.1) DSP process circuits control the driving current and modulation frequency of TDLAS drivings and modulation circuit according to measurement parameter
Rate generates modulated signal, and modulated signal is sent into extremely weak signal and extracts circuit；
3.2) TDLAS drivings and modulation circuit export frequency modulation current signal, frequency modulation electric current under the control of DSP process circuits
Signal is non-constant value；The frequency modulation current signal rising edge rises for linear scan, in modulated signal trailing edge rapid decrease
To zero；
3.3) semiconductor laser stimulated emission frequency under the frequency modulation current signal of TDLAS drivings and modulation circuit output
Constant and wavelength is with the shoot laser of curent change；
3.4) shoot laser of semiconductor laser is carried out shaping and expanded by optical system, and is pointed into car to be measured
Inside；
4) the one of wave band of shoot laser can be absorbed in alcohol gas molecule, and optical system is collected to be measured simultaneously
Weak laser signal that vehicle internal reflection is returned simultaneously is converged on the target surface of photodetector；
5) measurement of vehicle alcohol Gas Molecular Density to be measured；
5.1) photodetector produces atomic weak current signal under the irradiation of weak laser signal, described atomic weak
Modulation intelligence and shoot laser of the current signal including shoot laser are by alcohol gas molecule absorption wave band situation；
5.2) low noise pre-amplification circuit carries out low noise amplification to the low current signal and is converted to voltage letter
Number；
5.3) modulation frequency signal of pole weak signal extraction circuit combination DSP process circuits output is to the preposition amplification of low noise
The voltage signal of circuit output carries out correlation processing, completes the extraction to pole weak signal and the suppression of veiling glare signal；
5.4) DSP process circuits receiving pole weak signal extraction circuit extraction pole weak signal and with the demarcation of the step 1)
Curve is approached and compared, and draws the amplitude of shoot laser absorbed energy, and according to lambert-Beer law be finally inversed by by
Irradiate the alcohol gas molecular concentration of vehicle interior；
6) display and alarm of alcohol gas molecular concentration；
DSP process circuits, which transmit the in-car alcohol gas molecular concentration value calculated to instrument, sets input and data defeated
Go out display screen to be shown；
When measurement data exceedes given threshold, instrument sets input and data output display screen can be in a manner of sound and light alarm
Inform user of service.
Portable non-contact laser alcohol measurement apparatus based on above-mentioned optimization, it is comprised the following steps that：
1) fitting of calibration curve
It is defeated by gathering pole weak signal extraction circuit by the alcohol gas of harmony semiconductor laser irradiation various concentrations
The unlike signal amplitude gone out establishes functional relation and fitted calibration curve, and function and calibration curve are stored in into DSP process circuits
In；
2) input of measurement parameter；
Measurement parameter is inputted to instrument input and data output display screen are set, instrument sets input and data output to show
Measurement parameter is transferred to DSP process circuits by display screen；The measurement parameter includes measuring distance and alcohol molecule concentration warning level
Value；
3) shoot laser is excited and launched；
3.1) DSP process circuits control the driving current and modulation frequency of TDLAS drivings and modulation circuit according to measurement parameter
Rate generates modulated signal, and modulated signal is sent into extremely weak signal and extracts circuit；DSP processing circuit controls low-light (level) is high simultaneously
Sensitivity camera device causes it needing signal noise ratio (snr) of image captured by measuring distance to reach more than 30dB, and shoots vehicle to be measured
Realtime graphic, then by image return to instrument set input and data output display screen；
3.2) TDLAS drivings and modulation circuit export frequency modulation current signal, frequency modulation electric current under the control of DSP process circuits
Signal is non-constant value；The frequency modulation current signal rising edge rises for linear scan, in modulated signal trailing edge rapid decrease
To zero；
3.3) semiconductor laser stimulated emission frequency under the frequency modulation current signal of TDLAS drivings and modulation circuit output
Constant and wavelength is with the shoot laser of curent change；
3.4) shoot laser of semiconductor laser is carried out shaping and expanded by optical system, and is pointed into car to be measured
Inside；
4) the one of wave band of shoot laser can be absorbed in alcohol gas molecule, and optical system is collected to be measured simultaneously
Weak laser signal that vehicle internal reflection is returned simultaneously is converged on the target surface of photodetector；
5) measurement of vehicle alcohol Gas Molecular Density to be measured；
5.1) photodetector produces atomic weak current signal under the irradiation of weak laser signal, described atomic weak
Modulation intelligence and shoot laser of the current signal including shoot laser are by alcohol gas molecule absorption wave band situation；
5.2) low noise pre-amplification circuit carries out low noise amplification to the low current signal and is converted to voltage letter
Number；
5.3) modulation frequency signal of pole weak signal extraction circuit combination DSP process circuits output is to the preposition amplification of low noise
The voltage signal of circuit output carries out correlation processing, completes the extraction to pole weak signal and the suppression of veiling glare signal；
5.4) DSP process circuits receiving pole weak signal extraction circuit extraction pole weak signal and with the demarcation of the step 1)
Curve is approached and compared, and draws the amplitude of shoot laser absorbed energy, and according to lambert-Beer law be finally inversed by by
Irradiate the alcohol gas molecular concentration of vehicle interior；
6) display and alarm of alcohol gas molecular concentration；
DSP process circuits shoot the in-car alcohol molecule concentration value calculated and low-light (level) high sensitivity camera device
View data is merged, and is transmitted to instrument and set input and data output display screen to be shown that the content of display includes
The image information of vehicle and driver, the alcohol molecule concentration value of the vehicle interior and the alcohol content progress with colour code
Bar；
When measurement data exceedes given threshold, instrument sets input and data output display screen can be in a manner of sound and light alarm
Inform user of service.
Above two method all also includes step 6) data storage, and it is specifically：
Press the data saving button that instrument sets input and data output display screen；DSP data processing circuits receive
When setting the preservation instruction of the data of input and data output display screen from instrument, by the view data and alcohol molecule of the vehicle
Concentration data is stored in data storage circuitry.
The advantage of the invention is that：
1st, the present invention does not need driver's parking, it is only necessary to which traffic police personnel hold equipment alignment and travelled at a distance
Vehicle, if without exception, the vehicle can normal pass, so as to improve detection efficiency, congestion in road will not be caused
2nd, for the present invention using TDLAS drivings and modulation circuit, emission wavelength modulation is stable, will not be outer by temperature, humidity etc.
Boundary's environmental change and it is impacted.
3rd, the present invention is to utilize Spectrum Absorption Principle, and absworption peak is certain for predetermined substance, will not be by other
The doping of material and influence measurement result.
4th, the present invention uses correlation facture, well can be suppressed veiling glare noise so as to obtain higher letter
Make an uproar and compare, ensure that measurement accuracy.
5th, the present invention is portable instrument, can hold the instrument or the instrument is erected at into roadside use.
6th, the present invention is easy to use directly perceived, and user of service can quickly judge testing result according to image, data and color；
7th, the present invention addition of low-light (level) high sensitivity camera device, and figure is carried out to target vehicle under environment that can be dark
As shooting.
8th, DSP process circuits of the invention can control additional low-light (level) high sensitivity camera device to automatically adjust Jiao
Away from, aperture, time for exposure and gain, it is not necessary to regulation manually.
9th, the present invention can preserve the view data at scene and measurement data, convenient to check afterwards.
10th, detection speed of the present invention is fast, and detection time is less than 0.1s, and high speed can be realized in 100km/h vehicle
The detection of alcohol molecule concentration.
11st, the present invention does not use the alcohol content of traditional air blast measurement driver's exhaled gas, safety and sanitation.
12nd, the present invention uses non-contact method, and farthest measuring distance is 100m, and acquiescence measurement distance is 20m；
Brief description of the drawings
Fig. 1 is the structure diagram of the embodiment of the present invention 1.
Fig. 2 is the structure diagram of the embodiment of the present invention 2.
Reference is as follows：
1-DSP process circuits, 2-TDLAS drivings and modulation circuit, 3- semiconductor lasers, 4- optical systems, 5- photoelectricity
Detector, 6- low noises pre-amplification circuit, 7- poles weak signal extraction circuit, 8- low-light (level) high sensitivity camera device, 9- instrument
Device sets input and data output display screen.
Embodiment
Apparatus and method of the present invention is introduced below by two embodiments：
Embodiment 1：
As shown in figure 1, the present invention is by DSP process circuits 1, TDLAS drivings and modulation circuit 2, semiconductor laser 3, light
System 4, photodetector 5, low noise pre-amplification circuit 6, pole weak signal extraction circuit 7, instrument set input and data
Output display screen 9 and data storage circuit group into.
The specific structure of device is：
DSP process circuits 1 are set with TDLAS drivings and modulation circuit 2, pole weak signal extraction circuit 7 and instrument respectively
Input and data output display screen 9 electrically connect；
TDLAS drives and the vitalizing semiconductor laser device 3 of modulation circuit 2 sends shoot laser, and shoot laser passes through optical system
Vehicle interior to be measured is pointed into after system；Optical system 4 receives the weak laser signal of vehicle interior to be measured reflection and by its meeting
Gather on the target surface of photodetector 5；
Photodetector 5 extracts circuit 7 with pole weak signal by low noise pre-amplification circuit 6 and electrically connected；
Data storage circuitry electrically connects with DSP process circuits 1.
It should be noted that：
The optical system uses parabola optical collector form.
Optical system and the farthest horizontal range of vehicle to be measured are 100m.
Low noise pre-amplification circuit is in gain 106Under the conditions of noise as little as 1mVrmsBelow.
According to the above-mentioned description to apparatus structure, now its specific work process is described as follows：
1) fitting of calibration curve
The device is in the design phase, it is necessary to which the parameter such as detection dynamic range, the linearity to device is demarcated, i.e., to warp
Cross the alcohol gas and dress of harmony laser (energy and modulation system are consistent with formal product) irradiation various concentrations (linear to change)
The signal amplitude for putting middle pole weak signal extraction circuit output establishes functional relation and matched curve, and the function and curve are stored in
In DSP process circuits；
2) input and data output display screen 9 is set to adjust measuring distance (apart from maximum 100m) and alcohol point by instrument
Sub- concentration alarm threshold value, set content can be transferred to DSP process circuits 1；
3) DSP process circuits 1 adjust driving current and modulation according to set content, control TDLAS drivings and modulation circuit 2
Frequency, and modulated signal is delivered into pole weak signal extraction circuit 7；
4) TDLAS drivings and modulation circuit 2 export frequency modulation current signal under the control of DSP process circuits 1, and electric current is non-
Steady state value, rise in modulated signal rising edge for linear scan, zero is rapidly dropped in modulated signal trailing edge；
5) the stimulated emission frequency under the frequency modulation current signal that TDLAS drivings and modulation circuit 2 export of semiconductor laser 3
Certain but wavelength is with the laser of drive current variations；
6) laser that semiconductor laser 3 is launched is carried out shaping and expanded by optical system 4, and passes through distant place driving vehicle
Windshield be pointed into vehicle interior；
7) laser of transmitting is tuning type, and one of wave band can be absorbed in alcohol gas molecule, and optical system 4 is same
When the weak laser signal that reflects of collection space and converge on the target surface of photodetector 5；
8) photodetector 5 produces atomic weak current signal under the irradiation of weak laser signal, and the current signal contains
There is the modulation intelligence of transmitting, also containing transmitting laser some wave band by absorbing state；
9) low current signal that low noise pre-amplification circuit 6 exports to photodetector 5 carries out low noise amplification simultaneously
Voltage signal is converted to, in gain 106Under the conditions of noise as little as 1mVrmsBelow；
10) pole weak signal extraction circuit 7 combines the modulating frequency amplification electricity preposition to low noise of the output of DSP process circuits 1
The voltage signal that road 6 exports carries out correlation processing, and (correlation processing is lock phase amplifying method or coherent sampling integration method etc.
Deng), complete the extraction to pole weak signal and the suppression of veiling glare signal；
11) DSP process circuits receiving pole weak signal extraction circuit extraction pole weak signal and with the demarcation of the step 1)
Curve is approached and compared, and draws the amplitude of shoot laser absorbed energy, and according to lambert-Beer law be finally inversed by by
Irradiate the alcohol gas molecular concentration of vehicle interior；
12) DSP process circuits 1, which transmit the in-car alcohol molecule concentration value calculated to instrument, sets input and data defeated
Go out display screen 9 to be shown, facilitate the quick judgement of traffic police personnel；
When measurement data exceedes given threshold, instrument sets input and data output display screen 9 can be with sound and light alarm side
Formula informs user of service；
13) if necessary, user of service presses the data saving button that instrument sets input and data output display screen 9；
The preservation of the data of input and data output display screen 9 is set to refer to from instrument when DSP data processing circuits 1 receive
When making, the view data of the vehicle and alcohol molecule concentration data are stored in data storage circuitry, it is convenient to check afterwards.
Vehicle license plate information and driver's face information can be accurately learned for the ease of law enfrocement official, the present invention also provides
Prioritization scheme, it is specific as follows：
Embodiment 2：
As shown in Fig. 2 the present invention is by DSP process circuits 1, TDLAS drivings and modulation circuit 2, semiconductor laser 3, light
System 4, photodetector 5, low noise pre-amplification circuit 6, pole weak signal extraction circuit 7, the shooting of low-light (level) high sensitivity
Device 8, instrument set input and data output display screen 9 and data storage circuit group into.
The specific structure of device is：
DSP process circuits 1 are driven respectively with TDLAS and modulation circuit 2, low-light (level) high sensitivity camera device 8, extremely weak letter
Number extraction circuit 7 and instrument set input and data output display screen 9 electrically connect；
TDLAS drives and the vitalizing semiconductor laser device 3 of modulation circuit 2 sends shoot laser, and shoot laser passes through optical system
Vehicle interior to be measured is pointed into after system；Optical system 4 receives the weak laser signal of vehicle interior to be measured reflection and by its meeting
Gather on the target surface of photodetector 5；
Photodetector 5 extracts circuit 7 with pole weak signal by low noise pre-amplification circuit 6 and electrically connected；
Data storage circuitry electrically connects with DSP process circuits 1.
It should be noted that：
Optical system uses parabola optical collector form.
Optical system and the farthest horizontal range of vehicle to be measured are 100m.
Low noise pre-amplification circuit is in gain 106Under the conditions of noise as little as 1mVrmsBelow.
Low-light (level) high sensitivity camera device is used for the image for shooting vehicle to be measured；Low-light (level) high sensitivity camera device
There is the signal to noise ratio not less than 30dB under conditions of 0.003Lux@F1.2 so that contour of object can be clearly differentiated in image.
According to the above-mentioned description to apparatus structure, now its specific work process is described as follows：
1) fitting of calibration curve
The device is in the design phase, it is necessary to which the parameter such as detection dynamic range, the linearity to device is demarcated, i.e., to warp
Cross the alcohol gas and dress of harmony laser (energy and modulation system are consistent with formal product) irradiation various concentrations (linear to change)
The signal amplitude for putting middle pole weak signal extraction circuit output establishes functional relation and matched curve, and the function and curve are stored in
In DSP process circuits；
2) input and data output display screen 9 is set to adjust measuring distance (apart from maximum 100m) and alcohol point by instrument
Sub- concentration alarm threshold value, set content can be transferred to DSP process circuits 1；
3) DSP process circuits 1 control low-light (level) high sensitivity camera device 8 to automatically adjust Jiao first according to set content
Away from, aperture, time for exposure and gain so that needing signal noise ratio (snr) of image captured by measuring distance to reach more than 30dB, and can
It is clear to differentiate contour of object, image is then returned into instrument and sets input and data output display screen 9 to be shown；Same time control
TDLAS drivings processed and modulation circuit 2 adjust driving current and modulating frequency, and modulated signal is delivered into pole weak signal extraction circuit
7；
4) TDLAS drivings and modulation circuit 2 export frequency modulation current signal under the control of DSP process circuits 1, and electric current is non-
Steady state value, rise in modulated signal rising edge for linear scan, zero is rapidly dropped in modulated signal trailing edge；
5) the stimulated emission frequency under the frequency modulation current signal that TDLAS drivings and modulation circuit 2 export of semiconductor laser 3
Certain but wavelength is with the laser of drive current variations；
6) laser that semiconductor laser 3 is launched is carried out shaping and expanded by optical system 4, and passes through distant place driving vehicle
Windshield be pointed into vehicle interior；
7) laser of transmitting is tuning type, and one of wave band can be absorbed in alcohol gas molecule, and optical system 4 is same
When the weak laser signal that reflects of collection space and converge on the target surface of photodetector 5；
8) photodetector 5 produces atomic weak current signal under the irradiation of weak laser signal, and the current signal contains
There is the modulation intelligence of transmitting, also containing transmitting laser some wave band by absorbing state；
9) low current signal that low noise pre-amplification circuit 6 exports to photodetector 5 carries out low noise amplification simultaneously
Voltage signal is converted to, in gain 106Under the conditions of noise as little as 1mVrmsBelow；
10) pole weak signal extraction circuit 7 combines the modulating frequency amplification electricity preposition to low noise of the output of DSP process circuits 1
The voltage signal that road 6 exports carries out correlation processing, and (correlation processing is lock phase amplifying method or coherent sampling integration method etc.
Deng), complete the extraction to pole weak signal and the suppression of veiling glare signal；
11) the receiving pole weak signal of DSP process circuits 1 extraction circuit extraction pole weak signal and with the demarcation of the step 1)
Curve is approached and compared, and draws the amplitude of shoot laser absorbed energy, and according to lambert-Beer law be finally inversed by by
Irradiate the alcohol gas molecular concentration of vehicle interior；
12) DSP process circuits 1 are by the in-car alcohol molecule concentration value calculated and low-light (level) high sensitivity camera device 8
The view data of shooting is merged, and transmit to instrument set input and data output display screen 9 shown, display it is interior
Hold comprising the vehicle and image information of driver, the alcohol molecule concentration value of the vehicle interior and content progress with colour code
Bar, facilitate the quick judgement of traffic police personnel；When measurement data exceedes given threshold, instrument sets input and data output
Display screen 9 can inform user of service in a manner of sound and light alarm；
13) if necessary, user of service presses the data saving button that instrument sets input and data output display screen 9；
The preservation of the data of input and data output display screen 9 is set to refer to from instrument when DSP data processing circuits 1 receive
When making, the view data of the vehicle and alcohol molecule concentration data are stored in data storage circuitry, it is convenient to check afterwards.
Claims (10)
- A kind of 1. Portable non-contact laser alcohol measurement apparatus, it is characterised in that：Including DSP process circuits, TDLAS drivings and modulation circuit, semiconductor laser, optical system, photodetector, low noise Sound pre-amplification circuit, pole weak signal extraction circuit and instrument set input and data output display screen；DSP process circuits set input and number with TDLAS drivings and modulation circuit, pole weak signal extraction circuit and instrument respectively Electrically connected according to output display screen；TDLAS drives and modulation circuit vitalizing semiconductor swashs device light and sends shoot laser, and shoot laser after optical system by shining To vehicle interior to be measured；Optical system receives the weak laser signal of vehicle interior reflection to be measured and is converged at photoelectricity On detector target surface；Photodetector extracts circuit with pole weak signal by low noise pre-amplification circuit and electrically connected.
- 2. Portable non-contact laser alcohol measurement apparatus according to claim 1, it is characterised in that：Also include low-light (level) High sensitivity camera device；The low-light (level) high sensitivity camera device electrically connects to be measured for shooting with DSP process circuits The image of vehicle；Low-light (level) high sensitivity camera device has the noise not less than 30dB under conditions of 0.003Lux@F1.2 Than.
- 3. Portable non-contact laser alcohol measurement apparatus according to claim 1 or 2, it is characterised in that：Also include number According to storage circuit；The data storage circuitry electrically connects with DSP data processing circuits.
- 4. Portable non-contact laser alcohol measurement apparatus according to claim 3, it is characterised in that：The optical system Using parabola optical collector form.
- 5. Portable non-contact laser alcohol measurement apparatus according to claim 1, it is characterised in that：The optical system Farthest horizontal range with vehicle to be measured is 100m.
- 6. Portable non-contact laser alcohol measurement apparatus according to claim 1, it is characterised in that：Before the low noise Amplifying circuit is put in gain 106Under the conditions of noise as little as 1mVrmsBelow.
- 7. the measuring method based on the Portable non-contact laser alcohol measurement apparatus described in claim 1, it is characterised in that bag Include following steps：1) fitting of calibration curveBy the alcohol gas of harmony semiconductor laser irradiation various concentrations, circuit output is extracted by gathering pole weak signal Unlike signal amplitude establishes functional relation and fitted calibration curve, and function and calibration curve are stored in DSP process circuits；2) input of measurement parameter；Measurement parameter is inputted to instrument input and data output display screen are set, instrument sets input and data output display screen Measurement parameter is transferred to DSP process circuits；The measurement parameter includes measuring distance and alcohol molecule concentration alarm threshold value；3) shoot laser is excited and launched；3.1) DSP process circuits control the driving current and modulating frequency of TDLAS drivings and modulation circuit to give birth to according to measurement parameter Into modulated signal, and modulated signal is sent into extremely weak signal and extracts circuit；3.2) TDLAS drivings and modulation circuit export frequency modulation current signal, frequency modulation current signal under the control of DSP process circuits For non-constant value；The frequency modulation current signal rising edge rises for linear scan, and zero is rapidly dropped in modulated signal trailing edge；3.3) semiconductor laser stimulated emission frequency-invariant under the frequency modulation current signal of TDLAS drivings and modulation circuit output And wavelength is with the shoot laser of curent change；3.4) shoot laser of semiconductor laser is carried out shaping and expanded by optical system, and is pointed into vehicle to be measured Portion；4) the one of wave band of shoot laser can be absorbed in alcohol gas molecule, and optical system collects vehicle to be measured simultaneously Weak laser signal that internal reflection is returned simultaneously is converged on the target surface of photodetector；5) measurement of vehicle alcohol Gas Molecular Density to be measured；5.1) photodetector produces atomic weak current signal, the atomic weak electric current under the irradiation of weak laser signal Modulation intelligence and shoot laser of the signal including shoot laser are by alcohol gas molecule absorption wave band situation；5.2) low noise pre-amplification circuit carries out low noise amplification to the low current signal and is converted to voltage signal；5.3) modulation frequency signal of pole weak signal extraction circuit combination DSP process circuits output is to low noise pre-amplification circuit The voltage signal of output carries out correlation processing, completes the extraction to pole weak signal and the suppression of veiling glare signal；5.4) DSP process circuits receiving pole weak signal extraction circuit extraction pole weak signal and with the calibration curve of the step 1) Approached and compared, draw the amplitude of shoot laser absorbed energy, and be finally inversed by according to lambert-Beer law illuminated The alcohol gas molecular concentration of vehicle interior；6) display and alarm of alcohol gas molecular concentration；DSP process circuits, which transmit the in-car alcohol gas molecular concentration value calculated to instrument, sets input and data output to show Display screen is shown；When measurement data exceedes given threshold, instrument sets input and data output display screen to be informed in a manner of sound and light alarm User of service.
- 8. the measuring method of Portable non-contact laser alcohol measurement apparatus according to claim 7, it is characterised in that：Also Including step 6) data storage, it is specifically：Press the data saving button that instrument sets input and data output display screen；DSP data processing circuits, which receive, to be come from When instrument sets the preservation instruction of the data of input and data output display screen, by the view data of the vehicle and alcohol molecule concentration Data are stored in data storage circuitry.
- 9. the measuring method based on the Portable non-contact laser alcohol measurement apparatus described in claim 2, it is characterised in that bag Include following steps：1) fitting of calibration curveBy the alcohol gas of harmony semiconductor laser irradiation various concentrations, circuit output is extracted by gathering pole weak signal Unlike signal amplitude establishes functional relation and fitted calibration curve, and function and calibration curve are stored in DSP process circuits；2) input of measurement parameter；Measurement parameter is inputted to instrument input and data output display screen are set, instrument sets input and data output display screen Measurement parameter is transferred to DSP process circuits；The measurement parameter includes measuring distance and alcohol molecule concentration alarm threshold value；3) shoot laser is excited and launched；3.1) DSP process circuits control the driving current and modulating frequency of TDLAS drivings and modulation circuit to give birth to according to measurement parameter Into modulated signal, and modulated signal is sent into extremely weak signal and extracts circuit；DSP processing circuit controls low-light (level)s are highly sensitive simultaneously Degree camera device causes it needing signal noise ratio (snr) of image captured by measuring distance to reach more than 30dB, and shoots the reality of vehicle to be measured When image, then by image return to instrument set input and data output display screen；3.2) TDLAS drivings and modulation circuit export frequency modulation current signal, frequency modulation current signal under the control of DSP process circuits For non-constant value；The frequency modulation current signal rising edge rises for linear scan, and zero is rapidly dropped in modulated signal trailing edge；3.3) semiconductor laser stimulated emission frequency-invariant under the frequency modulation current signal of TDLAS drivings and modulation circuit output And wavelength is with the shoot laser of curent change；3.4) shoot laser of semiconductor laser is carried out shaping and expanded by optical system, and is pointed into vehicle to be measured Portion；4) the one of wave band of shoot laser can be absorbed in alcohol gas molecule, and optical system collects vehicle to be measured simultaneously Weak laser signal that internal reflection is returned simultaneously is converged on the target surface of photodetector；5) measurement of vehicle alcohol Gas Molecular Density to be measured；5.1) photodetector produces atomic weak current signal, the atomic weak electric current under the irradiation of weak laser signal Modulation intelligence and shoot laser of the signal including shoot laser are by alcohol gas molecule absorption wave band situation；5.2) low noise pre-amplification circuit carries out low noise amplification to the low current signal and is converted to voltage signal；5.3) modulation frequency signal of pole weak signal extraction circuit combination DSP process circuits output is to low noise pre-amplification circuit The voltage signal of output carries out correlation processing, completes the extraction to pole weak signal and the suppression of veiling glare signal；5.4) DSP process circuits receiving pole weak signal extraction circuit extraction pole weak signal and with the calibration curve of the step 1) Approached and compared, draw the amplitude of shoot laser absorbed energy, and be finally inversed by according to lambert-Beer law illuminated The alcohol gas molecular concentration of vehicle interior；6) display and alarm of alcohol gas molecular concentration；The image that DSP process circuits shoot the in-car alcohol molecule concentration value calculated and low-light (level) high sensitivity camera device Data are merged, and are transmitted to instrument and set input and data output display screen to be shown that the content of display includes vehicle The alcohol molecule concentration value of image information, the vehicle interior with driver and the alcohol content progress bar with colour code；When measurement data exceedes given threshold, instrument sets input and data output display screen to be informed in a manner of sound and light alarm User of service.
- 10. the measuring method of Portable non-contact laser alcohol measurement apparatus according to claim 9, it is characterised in that： Also include step 6) data storage, it is specifically：Press the data saving button that instrument sets input and data output display screen；DSP data processing circuits, which receive, to be come from When instrument sets the preservation instruction of the data of input and data output display screen, by the view data of the vehicle and alcohol molecule concentration Data are stored in data storage circuitry.
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