CN101936896A - Alcohol gas concentration laser telemetering device - Google Patents
Alcohol gas concentration laser telemetering device Download PDFInfo
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- CN101936896A CN101936896A CN 201010246210 CN201010246210A CN101936896A CN 101936896 A CN101936896 A CN 101936896A CN 201010246210 CN201010246210 CN 201010246210 CN 201010246210 A CN201010246210 A CN 201010246210A CN 101936896 A CN101936896 A CN 101936896A
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Abstract
The invention discloses an alcohol gas concentration laser telemetering device comprising a laser device control and emission system and a signal receiving, analysis and display system, wherein the laser device control and emission system comprises a modulating signal generator which is connected with a laser controller, a diode laser device and a laser emission device in sequence; the signal receiving, analysis and display system comprises a phase lock amplifier, a data acquisition and analysis device, a system display and alarm device and a laser receiving device, wherein the phase lock amplifier is respectively connected with the modulating signal generator, the laser emission device, the data acquisition and analysis device and the laser receiving device; and the output end of the data acquisition and analysis device is connected with the input end of the system display and alarm device. The invention can remotely carry out predetection on alcohol content in the air in a vehicle, thereby improving the pertinence and the accuracy of drunk driving checking, improving the enforcement work efficiency and reducing the police strength application.
Description
Technical field
The present invention relates to a kind of alcohol gas pick-up unit, be specifically related to a kind of alcohol gas concentration laser telemetry device.
Background technology
The motor vehicle of driving when intoxicated is a kind of behavior with social harm of ignoring self and other peoples' personal safety.The tragedy that causes because of driving when intoxicated is all taking place every day, public safety traffic management department also is to have dropped into a large amount of police strength to investigate in emphasis time period and location to this and drinking drive behavior, but owing to can't judge whether vehicle driver drives when intoxicated, the investigation of the formula of can only casting net, so not only efficient is lower, has also influenced normal traffic order.
Traditional alcohol concentration detecting instrument---" expiration formula alcohol content tester " adopts electrochemical principle, accurately probe gas alcohol content.Its principle is when the oxide with N type electric conductivity is exposed in the atmosphere, can reduces its inner electron amount owing to the absorption of oxygen its resistance is increased.If there is certain specific reducibility gas thereafter in the atmosphere, it will with the oxygen reaction of absorption, thereby the electron number in the oxide is increased, cause oxide resistor to reduce.Semiconductor-oxide sensor is exactly that variation by this resistance comes analytical gas concentration.But such detection method needs equipment can directly contact tested gas, obviously is not suitable for remote detection.
Summary of the invention
At above-mentioned prior art can not long-range detection gaseous alcohol content problem, the object of the present invention is to provide a kind of alcohol gas concentration laser telemetry device, utilize spectral principle to carry out pre-detection by long-range alcoholic content to air in the vehicle.
The technical solution used in the present invention: a kind of alcohol gas concentration laser telemetry device, this device is made up of laser instrument control and emission coefficient and signal reception, analysis and display system; Described laser instrument control and emission coefficient comprise modulation signal generator, and described modulation signal generator is connected successively with laser controller, diode laser and laser beam emitting device; Described signal reception, analysis and display system comprise lock-in amplifier, data collection and analysis device, system's demonstration and warning device and laser receiver, and described lock-in amplifier is connected with laser receiver with described modulation signal generator, laser beam emitting device, data collection and analysis device respectively; The output terminal of described data collection and analysis device shows with described system and is connected with the input end of warning device.
When working, the present invention at first controls laser power by laser controlling and emission coefficient, export the laser of stable specific wavelength, launch laser by Optical Fiber Transmission to hand-held laser beam emitting device, be mapped on the air that contains ethanol to be measured, the laser that ethanol gas is known from experience this wavelength produces an absorption spectrum, absorbed laser is received by laser receiver by diffuse reflection, carry out a series of signals collecting, analyzing and processing by equipment data acquisition analyzing, on liquid crystal display, show and warning.
Should have single mode, live width as LASER Light Source and will can scan characteristics such as strong absorption line much smaller than molecular spectrum live width, laser frequency by alcohol molecule based on the gas optical detection of laser absorption spectrum, can obtain high sensitivity detection, also necessarily require enough big laser power for remote remote measurement.
In order to realize the narrow linewidth output of diode laser, the present invention adopts low-power consumption diode laser, diode electrically stream controller and laser temperature PID controller and signal generator.Signal generator can produce sine wave and sawtooth wave simultaneously, after the totalizer stack, be injected into diode laser and utilize the diode laser current controller to carry out Laser Modulation and scanning, modulation signal divides two parts: a part is a sawtooth signal, and another part is a sine wave signal.Sawtooth signal is superimposed upon on the direct current of laser diode current, is used for the wavelength of laser instrument is scanned, and sweep limit is relatively slow modulation variation by the amplitude decision of sawtooth wave, about tens hertz of frequency.Sine wave signal is superimposed upon on the sawtooth wave, be used for the modulated laser frequency, and as the reference signal to absorption signal carry out once, second harmonic signal carries out demodulation, the ratio of modulation amplitude and sawtooth amplitude is relevant with the best index of modulation, this is comparatively faster modulation variation.
The output of diode laser is by optical fiber coupling output, is connected to system's light transmitting terminal in the hand-held detector by ring flange from optical fiber again.Because the rear orientation light of scattering thing is very weak usually, and the angle of divergence of diode laser is bigger, if directly laser is sent then at a distance the ground hot spot is too big again, the luminous energy that reflects will be too weak and be difficult to measure leakage signal.Here use the transmitting terminal of medium refraction index lens (and laser aligner) as laser, these medium refraction index lens are column type glass lenss, be about 4.8mm, the surface is coated with the antireflection mould, and a corner cut arranged, avoided etalon effect well, the so-called grin lens of this lens uses these lens can effectively reduce the spot size of laser.
It is that 100mm, focal length are that the lens of 18cm are used to collect scattered signal that hand-held detecting head front end is equipped with bore, and the laser that the lens scatter body reflects is collected and converged on the photodetector at focus place.Detector converts light signal to electric signal and sends into Circuits System, carry out respectively once and the second harmonic signal demodulation by lock-in amplifier, restituted signal is carried out data acquisition and is carried out real time data processing and analysis by data acquisition system (DAS) again, and its result is presented on the LCD in real time.
Beneficial effect of the present invention: " long-range alcohol gas concentration detection apparatus " then is to use handheld device to utilize the long-range alcoholic content to air in the vehicle of spectral principle to carry out pre-detection, and the traffic police can use alcohol content tester further to confirm to check to the suspected vehicles driver according to the result that preliminary examination is measured.The result who checks out directly input system and as required the scene leave the punishment document.Can improve the specific aim accuracy that drunk driving is checked so greatly, improve law-enforcing work efficient, reduce the police strength utilization, and alleviate relation between the police and the people to a certain extent.
Description of drawings
The present invention is further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is a general structure schematic block diagram of the present invention;
Fig. 2 is laser controlling of the present invention and emission coefficient schematic block diagram;
Fig. 3 is signal reception of the present invention, analysis and display system schematic block diagram;
Fig. 4 combines the hand-held detector synoptic diagram of formation for Laser emission of the present invention and receiving trap;
Fig. 5 is medium refraction index lens and optical fiber collimator combination synoptic diagram.
Embodiment
As Fig. 1,2,3, the present invention is made up of with signal reception, analysis and display system 2 two parts laser instrument control and emission coefficient 1; Laser instrument control and emission coefficient 1 comprise modulation signal generator 11, laser controller 12, diode laser 13 and laser beam emitting device 14.Described modulation signal generator 11 is made of signal generator 111 and addition superimposer 112; Signal generator 111 is to addition superimposer 112 emission sine wave and sawtooth wave.Laser controller 12 is made of diode laser current controller 121 and laser temperature PID controller 122, both output terminals all are connected with the input end of diode laser 13, the output terminal of described diode laser 13 is connected with the input end of laser beam emitting device 14, and the output terminal of diode laser 13 is connected with the input end of addition superimposer 112.Sinusoidal wave and sawtooth wave is injected into diode laser 13 and utilizes the diode laser current controller to carry out Laser Modulation and scanning after 112 stacks of addition superimposer, modulation signal is divided into two parts: a part is a sawtooth signal, and another part is a sine wave signal; Sawtooth signal is superimposed upon on the direct current of laser diode current, is used for the wavelength of laser instrument is scanned; Sine wave signal is superimposed upon on the sawtooth wave, is used for the modulated laser frequency, and as the reference signal to absorption signal carry out once, second harmonic signal carries out demodulation.The output of described diode laser 13 is by optical fiber coupling output, is connected to the Laser emission end of hand-held detector again from optical fiber.Described Laser emission end adopts medium refraction index lens and laser aligner, and described medium refraction index lens are column type glass lenss, long 4.8mm, and the surface is coated with the antireflection mould, and a corner cut is arranged.
Signal reception, analysis and display system 2 comprise that lock-in amplifier 22, data collection and analysis device 23, system show and warning device 24 and laser receiver 21 that described lock-in amplifier 22 is connected with described modulation signal generator 11, laser beam emitting device 14, data collection and analysis device 23 and laser receiver 21 respectively; The output terminal of described data collection and analysis device 23 shows with described system and is connected with the input end of warning device 24.Data collection and analysis device 23 constitutes (analog/digital converter 231 is called for short ADC, and digital signal processor is called for short DSP) by analog/digital converter 231 and digital signal processor 232.
Diode laser 13 of the present invention is controlled by diode electrically stream controller and laser temperature PID controller, signal generator 111 produces a sawtooth wave and sinusoidal wave superposed signal comes diode laser 13 injection currents are carried out laser frequency scanning and modulation, realize near the frequency tuning of the laser molecule absorption peak, the sinusoidal wave while that signal generator 111 produces is input to lock-in amplifier 22 as demodulated reference signal.The sawtooth wave rising edge is used for the scan laser frequency, and the negative edge time is very short, is used for DSP and carries out data acquisition, analysis and processing.The frequency and the initialization outside port of dsp operation clock at first are set, are set the interrupt cycle of interrupt routine then and start interrupt routine.At first start outside ADC in the interrupt routine, obtain data converted, and data are carried out filtering, then the result is preserved in the array, the collection zone bit is set simultaneously.Main circulating program in the master routine just begins the data processing process after finding to gather flag set.After data processing finishes, judge earlier whether be used to revise the isoparametric button of threshold value is pressed, if by next processing button program and revise systematic parameter.After the button EOP (end of program), start liquid crystal and hummer control program, allow data result and systematic parameter (threshold value) be presented on the liquid crystal, control whether sounding of hummer according to logic determines simultaneously.
Laser emission of the present invention shown in Figure 4 and receiving trap are combined the hand-held detector synoptic diagram of formation.Hand-held detector comprises shell 3, establishes medium direct projection rate lens 4 at the front end of shell 3, has a circular hole to place optical fiber collimator 5 in the middle of the medium direct projection rate lens 4, referring to Fig. 5.The detector rear end is that photodetector 211 is placed at the focus place of lens, and the optical signal detection device links to each other with diode laser by optical fiber 7, and pilot lamp 6 is positioned at the detector lower end.The output of diode laser 13 is by optical fiber 7 coupling output, is connected to light transmitting terminal in the hand-held detector by optical fiber again.Because the rear orientation light of scattering thing is very weak usually, and the angle of divergence of diode laser is bigger, if directly laser is sent then at a distance the ground hot spot is too big again, the luminous energy that reflects will be too weak and be difficult to measure signal.Here use medium refraction index lens 4 and optical fiber collimator 5 transmitting terminal as laser, these medium refraction index lens are the thick about 4.8mm of a glass lens, the surface is coated with the antireflection mould, and the so-called grin lens of this lens uses these lens can effectively reduce the spot size of laser.
Medium refraction index lens 4 bores that hand-held detecting head front end is adorned are that 100mm, focal length are 18cm, are used to collect scattered signal, and the laser that medium direct projection rate lens reflect scatterer is collected and converged on the photodetector at focus place.Detector converts light signal to electric signal and sends into Circuits System, carry out respectively once and the second harmonic signal demodulation by lock-in amplifier, restituted signal is carried out data acquisition and is carried out real time data processing and analysis by data acquisition system (DAS) again, and its result is presented on the LCD in real time.
When working, instrument at first controls laser power by laser controlling and emission coefficient, export the laser of stable specific wavelength, launch laser by Optical Fiber Transmission to hand-held Laser emission/receiving trap, be mapped on the air that contains ethanol to be measured, the laser that ethanol gas is known from experience this wavelength produces an absorption spectrum, absorbed laser is received by laser receiver by diffuse reflection, carry out a series of signals collecting, analyzing and processing by data acquisition and analyzing subsystem, on liquid crystal display, show and warning.
Claims (6)
1. alcohol gas concentration laser telemetry device is characterized in that: this device is made up of laser instrument control and emission coefficient (1) and signal reception, analysis and display system (2); Described laser instrument control and emission coefficient (1) comprise modulation signal generator (11), and it is connected successively with laser controller (12), diode laser (13) and laser beam emitting device (14); Described signal reception, analysis and display system (2) comprise that lock-in amplifier (22), data collection and analysis device (23), system show and warning device (24) and laser receiver (21) that described lock-in amplifier (22) is connected with described modulation signal generator (11), laser beam emitting device (14), data collection and analysis device (23) and laser receiver (21) respectively; The output terminal of described data collection and analysis device (23) shows with described system and is connected with the input end of warning device (24).
2. the device of alcohol gas concentration in the remote detection air according to claim 1 is characterized in that: described modulation signal generator (11) is made of signal generator (111) and addition superimposer (112); Described signal generator (111) is to addition superimposer (112) emission sine wave and sawtooth wave; Described laser controller (12) is made of diode laser current controller (121) and laser temperature PID controller (122), both output terminals all are connected with the input end of described diode laser (13), the output terminal of described diode laser (13) is connected with the input end of described laser beam emitting device (14), and the output terminal of described addition superimposer (112) is connected with the input end of described diode laser current controller (121).
3. the device of alcohol gas concentration in the remote detection air according to claim 2, it is characterized in that: described sine wave and sawtooth wave are injected into diode laser (12) and utilize diode laser current controller (121) to carry out Laser Modulation and scanning after addition superimposer (112) stack, modulation signal is divided into two parts: a part is a sawtooth signal, and another part is a sine wave signal; Sawtooth signal is superimposed upon on the direct current of diode laser electric current, is used for the wavelength of laser instrument is scanned; Sine wave signal is superimposed upon on the sawtooth wave, is used for the modulated laser frequency, and as the reference signal to absorption signal carry out once, second harmonic signal carries out demodulation.
4. the device of alcohol gas concentration in the remote detection air according to claim 1 and 2 is characterized in that: the output of described diode laser (13) is by optical fiber coupling output, is connected to the transmitting terminal of the laser aid of hand-held detector from optical fiber.
5. the device of alcohol gas concentration in the remote detection air according to claim 4, it is characterized in that: the transmitting terminal of described laser aid adopts medium refraction index lens and optical fiber collimator, the thick 4.5-5.5mm of described medium refraction index lens, the surface is coated with the antireflection mould.
6. the device of alcohol gas concentration in the remote detection air according to claim 1, it is characterized in that: described laser receiver (21) is made of photodetector (211) and prime amplifier (212), and described photodetector (211) receives laser reflection signal and signal is transferred to described prime amplifier (212); Described data collection and analysis device (23) comprises D/A (231) and digital signal processor (232); Described lock-in amplifier (22) is passed to described D/A (231) with amplifying signal, and carries out signal Processing through described digital signal processor (232) and report to the police by display module (241) demonstration or warning device (242).
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| CN2010102462100A CN101936896B (en) | 2010-07-30 | 2010-07-30 | Alcohol gas concentration laser telemetering device |
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| CN2010102462100A CN101936896B (en) | 2010-07-30 | 2010-07-30 | Alcohol gas concentration laser telemetering device |
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| CN102226761A (en) * | 2011-03-21 | 2011-10-26 | 韩鲲 | Tobacco product detector |
| CN102254402A (en) * | 2011-06-30 | 2011-11-23 | 中国科学院长春光学精密机械与物理研究所 | Laser drunk-driving quick remote sensing and automatic test system |
| CN102252964A (en) * | 2011-06-30 | 2011-11-23 | 中国科学院长春光学精密机械与物理研究所 | Drunk driving remote-sensing fast laser automatic pre-checking device |
| CN102353649A (en) * | 2011-06-30 | 2012-02-15 | 中国科学院长春光学精密机械与物理研究所 | Method for remotely measuring ethanol gas concentration based on binary spectrum analysis technology |
| CN102359951A (en) * | 2011-06-30 | 2012-02-22 | 中国科学院长春光学精密机械与物理研究所 | Remote sensing quick laser automatic predetection device for drunk driving |
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| CN102608066A (en) * | 2011-12-30 | 2012-07-25 | 中国科学院安徽光学精密机械研究所 | Handheld laser drunk-driving telemetering and pre-warning system |
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| CN104330386A (en) * | 2014-11-04 | 2015-02-04 | 中国科学院长春光学精密机械与物理研究所 | Time division multiplexing-differential modulation laser driving device for detecting drunk driving |
| CN104792713A (en) * | 2015-04-14 | 2015-07-22 | 哈尔滨工业大学 | Drunk-driving remote-detection system based on semiconductor laser absorption spectrum technology and measuring method implemented by adopting drunk-driving remote-measuring system |
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| CN104198433A (en) * | 2014-09-14 | 2014-12-10 | 中国科学院合肥物质科学研究院 | Device and method for detecting concentration of human respiration marking gas on line by laser absorption spectroscopy technology |
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| CN104316493A (en) * | 2014-11-04 | 2015-01-28 | 中国科学院长春光学精密机械与物理研究所 | Time division multiplexing differential modulation type laser detection method and device for drunk driving |
| CN104330386A (en) * | 2014-11-04 | 2015-02-04 | 中国科学院长春光学精密机械与物理研究所 | Time division multiplexing-differential modulation laser driving device for detecting drunk driving |
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