CN206208752U - Motor-vehicle tail-gas remote sensing detection system based on tunable laser - Google Patents
Motor-vehicle tail-gas remote sensing detection system based on tunable laser Download PDFInfo
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- CN206208752U CN206208752U CN201621252249.2U CN201621252249U CN206208752U CN 206208752 U CN206208752 U CN 206208752U CN 201621252249 U CN201621252249 U CN 201621252249U CN 206208752 U CN206208752 U CN 206208752U
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Abstract
The utility model is related to a kind of motor-vehicle tail-gas remote sensing detection system based on tunable laser, and each laser in laser control module control laser module sends the detection light of required wave-length coverage respectively；The multi beam detection light that laser module sends collimates to form collimated light beam and be transmitted into optical mirror unit by beam path alignment array element；Under the conditions of open light path, optical reflection mirror unit will pass through the laser detection light beam of motor-vehicle tail-gas to reflex to, and light path is focused on and filter array unit is focused and filtering process, the detection light beam of line focus and filter array unit outgoing detects through semiconductor photo detector group and receives and be sent to computer through signal acquisition and processing unit, and computer calculates under the conditions of open light path each component concentration in motor-vehicle tail-gas.The utility model can be widely applied in motor-vehicle tail-gas remote sensing detection.
Description
Technical field
The utility model is, on a kind of motor-vehicle tail-gas remote sensing detection system based on tunable laser, to be related to motor-driven
Tail gas discharges detection technique field.
Background technology
Tail gas pollution of motor-driven vehicle has become the key factor of influence China urban air-quality, and Chinese Ministry of Environmental Protection is to 9, China
The source resolution result that big city is carried out shows there are 4 PM in city2.5Primary pollution source is motor vehicle, 1 PM in city2.5It is first
It is the moving source dominated by motor vehicle to want pollution source.With vehicle guaranteeding organic quantity continue to increase and 6 years inner exhaust gas of new car are exempted from
The issue of annual test policy, motor-vehicle tail-gas remote sensing monitoring technology turn into lifting emission from vehicles ability to supervise and efficiency it is important
Means.《The Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution》Clear stipulaties can not influence traffic from January 1 in 2016
In the case of satisfy the need upper traveling motor vehicle implement remote exhaust emission detection.It is " yellow with being phased out for the high pollution vehicles such as Huang mark car
Change and green, green change green " strict control, the discharge standard of state five progressively implement and the standard of state six drafts formulation, China road is up
The automotive emission level sailed will necessarily be significantly reduced, and this detectability just to motor-vehicle tail-gas remote sensing monitoring equipment is carried
Requirement higher is gone out.Due to motor-vehicle tail-gas complicated components, motor-vehicle tail-gas remote sensing monitoring equipment generally needs infrared light supply
(including infrared lamp or near infrared laser) and ultraviolet source (ultraviolet deuterium lamp) are combined and use.
Prior art discloses one kind using infrared lamp as continuous light source, using NDIR (non-dispersive
Infrared) commercial measurement CO, CO2, HC, using uviol lamp as light source use DUV technology for detection NOx.Also report in the prior art
Road with Near-infrared Tunable laser diode be light source using CO, the CO in TDLAS technology for detection tail gas2, it is with uviol lamp
The light source method of DOAS technology for detection HC, NO.Further, uviol lamp can be combined with the other technologies such as DOAS as light source
NO in detection tail gas2, SO2, NH3Deng.For the particulate matter in motor-vehicle tail-gas, prior art is reported with ultraviolet laser
For light source measurement exhaust particulate thing concentration or use ultraviolet light known to wavelength and infrared photo measure exhaust particulate thing concentration
Method.But, motor-vehicle tail-gas remote sensing technology as a kind of open light path detection, each group in tail gas in actually measurement
Can be influenceed by ambient temperature and humidity during point concentration, and NDIR, DOAS and DUV commercial measurement gas concentration and the close phase of humiture
Close, must frequently be demarcated according to physical condition when causing using these technologies.In addition, some motor-vehicle tail-gas remote sensing monitorings
The corresponding wavelength of Near-infrared Tunable laser diode that equipment is used belongs to CO and CO2Absorption in over-frequency band, in this wave band CO
And CO2Absorbability to detection light is very weak, leads to not further lift instrument detection precision.
Prior art also discloses a kind of remote vehicle emissions measurement system using based on QCL and side
Method.QCL as a kind of high sensitivity Trace gas detection preferable middle-infrared band light source, light-source monochromaticity
Good, line width is much smaller than the absorption line width of tested gas；Light source has spectral power density very high simultaneously, can be in room temperature work
Make lower high-resolution, the highly sensitive detection realized to many trace gas.But as emerging technology, current single quantum stage
The wavelength tuning speed for joining laser is very restricted, generally no greater than 100cm-1/ the second.Due to remote exhaust emission testing equipment
Used under the conditions of open light path, and can at a terrific speed to surrounding after motor-vehicle tail-gas are emitted from offgas duct
Environmental diffusion, change in concentration is very big so that remote exhaust emission testing equipment (such as 10ms) must be completed to each within the extremely short time
The measurement of individual species；Different Trace Species generally have stronger absorption in different wave-length coverages simultaneously, beyond single amount
The wavelength tuning range of son metering laser；Cause the QCL currently with middle infrared wavelength in high velocity conditions
Under accurate remote sensing survey is carried out to various traces in motor-vehicle tail-gas for each species single quanta cascade must be used sharp
Light device, and the cost for being directed to each species QCL is very high.Secondly, according to Lambert-Beer laws, gas
The factors such as temperature and pressure simultaneously by surrounding environment are understood in absorption of the body species under certain wavelength to be influenceed, therefore instruction in advance
Practice and the artificial neural network that uses must be while consider the influence of temperature and pressure, and the measurement of various species is blended in one
Bigger complexity is caused in individual neutral net, measurement effect is influenceed.
The content of the invention
Regarding to the issue above, the purpose of this utility model be to provide one kind can be in synchronization to motor-vehicle tail-gas component
The motor-vehicle tail-gas remote sensing detection system based on tunable laser that middle different plant species are detected.
To realize above-mentioned utility model purpose, the utility model takes following technical scheme：One kind is based on tunable laser
The motor-vehicle tail-gas remote sensing detection system of device, the system for remote exhaust emission measurement includes laser module, laser control module, light
Road collimating array unit, light path are focused on and filter array unit, semiconductor photo detector group, signal acquisition and processing unit,
Optical reflection mirror unit and computer；The laser control module controls each laser in the laser module to send out respectively
Go out the detection light of required wave-length coverage；The multi beam detection light that the laser module sends is by the beam path alignment array element
Collimation forms collimated light beam and is transmitted into the optical reflection mirror unit；Under the conditions of open light path, the optical mirror
Unit will pass through the laser detection light beam of motor-vehicle tail-gas reflex to the light path focus on and filter array unit be focused and
Filtering process, connects through the detection light beam of the focusing and filter array unit outgoing through semiconductor photo detector group detection
Receive and be sent to the computer through the signal acquisition and processing unit.
Further, the number of collimation lens, light path are focused on and filter array unit in the beam path alignment array element
The number of semiconductor photo detector swashs with described in number, the semiconductor photo detector group of middle condenser lens and optical filter
The number of the laser of light device module is corresponding.
Further, the motor-vehicle tail-gas remote sensing detection system also includes the automatic mark for carrying out automatic Calibration to light path
Determine device, the automatic calibration device is arranged on the focusing and filter array unit outside, and the automatic calibration device is electrically connected
Connect the computer.
Further, the motor-vehicle tail-gas remote sensing detection system also includes motor vehicle speed/acceleration analysis module and machine
Motor-car Car license recognition module, motor vehicle speed described in the calculating mechatronics/acceleration analysis module measurement and motor vehicle car
Board identification module.
Further, the laser module is by several Near-infrared Tunable lasers, middle Laser Regulated in Ultrared Band
With ultraviolet light/visible laser composition, the type and number of option of species laser are detected for motor-vehicle tail-gas, each
It is detected species one laser of correspondence.
Further, the semiconductor photo detector that the semiconductor photo detector is freezed using TEC.
Further, the laser control module includes temperature-control circuit and current control circuit, the temperature control
Each laser keeps stabilized operating temperature in the range of environment temperature -30~60 DEG C during circuit processed controls the laser module, institute
State current control circuit and produce sinusoidal current and sawtooth current simultaneously, sinusoidal current and sawtooth current are superimposed composition laser respectively
Driving current, each laser sends the detection light of required wave-length coverage in driving laser module.
Further, the beam path alignment array element uses the light of collimator lens array, each laser output to lead to
Cross corresponding collimation lens to be collimated, AR plated film non-spherical lenses are respectively adopted per collimating lens；The light path focus on and
Filter array unit includes focusing lens array and bandpass filter chip arrays, and the condenser lens in the focusing lens array is adopted
With the aspherical focus lamp of AR plated films, the light direction of corresponding collimation lens, the band in the bandpass filter chip arrays are respectively provided with
Pass filter is separately positioned on the light direction that enters of corresponding semiconductor photodetector, will after the bandpass filter filtering interfering light
Detection light is focused on carries out spectral measurement on corresponding semiconductor photo detector.
Due to taking above technical scheme, it has advantages below to the utility model：1st, the utility model is directed to each thing
Plant using near-infrared, middle Laser Regulated in Ultrared Band, ultraviolet/visible light laser, while each laser has corresponding half
Conductor photoelectric detector, therefore, it is possible to be detected to different plant species in synchronization simultaneously.2nd, the utility model can be used
QCL detected, the infrared light of different wave length, the utility model can be sent due to QCL
Can be formed to CO, CO by increasing the number of laser and detector2、NO、NO2、HC、SO2、NH3、N2It is dirty in the tail gas such as O, HC
Detected while dye thing, and can avoid and use the disadvantages such as the short, short life of optical path length caused by ultraviolet deuterium lamp so that set
It is standby can under longer light path long-term use.3rd, the utility model has used the semi-conductor photodetector and TEC that TEC freezes
The laser of refrigeration, due to increasing the working range and ability of TEC refrigeration so that system can be steady between -30~60 DEG C
Fixed work, it is ensured that equipment can normally be used under road environment high temperature and low temperature.4th, the utility model is due to using automatic mark
Determine device every 20~30 days automatic Calibrations once, it is ensured that the accuracy of measurement data in system operation.5th, this practicality
New tunable laser has high speed tuning performance, and the tail gas after being passed through to motor vehicle using the frequency of 100Hz is entered
Row scanning, can greatly improve sampling rate and tail gas concentration proportion fitting accuracy rate.6th, NO, CO, CO of the present utility model2、HC
Detection laser centre wavelength Deng species has corresponded to fundamental frequency absworption peak, big compared to using absorption in over-frequency spike detection sensitivity long
It is big to improve.The utility model can be widely applied in motor-vehicle tail-gas remote sensing detection.
Brief description of the drawings
Fig. 1 is the structural representation of motor-vehicle tail-gas remote sensing detection system of the present utility model；
Fig. 2 is the light path principle schematic diagram of laser module of the present utility model；
Fig. 3 is the light path principle schematic diagram of beam path alignment array element of the present utility model；
Fig. 4 is the light path principle schematic diagram of focusing of the present utility model and filter array unit；
Fig. 5 is motor-vehicle tail-gas remote sensing detection method flow schematic diagram of the present utility model.
Specific embodiment
It is described in detail to of the present utility model with reference to the accompanying drawings and examples.It should be appreciated, however, that accompanying drawing
It has been provided only and has more fully understood the utility model, they has should not be understood paired limitation of the present utility model.
As shown in figure 1, the motor-vehicle tail-gas remote sensing detection system based on tunable laser that the utility model is provided, bag
Laser module 101, laser control module 102, beam path alignment array element 103, light path is included to focus on and filter array unit
104th, semiconductor photo detector group 105, signal acquisition and processing unit 106, automatic calibration device 107, optical mirror list
Unit 108, motor vehicle speed/acceleration analysis module 109, automobile license plate identification module 110 and computer 111, wherein, light path
The number of collimation lens in collimating array unit 103, light path focus on and filter array unit 104 in condenser lens and optical filter
In number, semiconductor photo detector group 105 number of semiconductor photo detector with the laser of laser module 101
Number is corresponding.
Each laser in the control laser of laser control module 102 module 101 sends required wave-length coverage respectively
Detection light；The multi beam detection light that laser module 101 sends forms collimated light beam simultaneously by the collimation of beam path alignment array element 103
Optical reflection mirror unit 108 is transmitted into, under the conditions of open light path, optical reflection mirror unit 108 wears laser detection light beam
Cross motor-vehicle tail-gas and reflex to that light path is focused on and filter array unit 104 is focused and filtering process respectively, line focus and filter
The detection light beam of the outgoing of optical arrays unit 104 through semiconductor photo detector group 105 detection receive and be sent to signal acquisition and
Processing unit 106, signal acquisition and processing unit 106 are processed the signal of reception, and will process the data is activation for obtaining
To computer 111, computer 111 calculates under the conditions of open light path each component in motor vehicle exhaust according to burning equation
Concentration.
Automatic calibration device 107 is used to carry out automatic Calibration to light path, when using, is arranged on focusing and filter array unit
108 outsides (initial position is placed on outside detection light path), computer 111 controlled automatic calibration device 107 every 20~30 days
Each species passage is demarcated before operating to light path focusing and filter unit 104, automatic calibration device 107 is specific calibrated
Journey is prior art, be will not be repeated here.
Motor vehicle speed/acceleration analysis module 109 is used to measure speed and acceleration of the motor vehicle in tail gas monitoring point
And the data is activation that obtains to computer 111 will be measured.
The photo of headstock or tailstock when automobile license plate identification module 110 is used to shoot motor vehicle by tail gas monitoring point
And Car license recognition is carried out, and license plate recognition result is sent to computer 111.
In a preferred embodiment, the Near-infrared Tunable laser that laser module 101 is freezed by several TEC
Device, middle Laser Regulated in Ultrared Band and ultraviolet light/visible laser composition, can be directed to and be detected option of species laser
Type and number, each one laser of detected species correspondence.For example：For have stronger absorption near infrared band CO,
CO2、NH3And O2Near infrared laser (0.76~2.3um) can be used；For HC, SO2、NOxInhaled near infrared band Deng other
INFRARED QUANTUM CASCADE LASERS in receiving the larger species of weaker and ambient interferences and can using；Wherein CO, CO2, HC, NO laser
Corresponding wavelength is respectively 2326.8nm, 2004.0nm, 3370nm and 5362.93nm, and the fundamental frequency of each species has been corresponded to respectively
Absorption band.Detection for particulate matter in tail gas can use ultraviolet 250nm lasers or visible 550nm lasers.This reality
With new with detection CO, CO simultaneously2、NH3、O2, the composition of laser module 101 is illustrated as a example by HC and NO.As shown in Fig. 2 laser
Device control module 102 includes temperature-control circuit 201 and current control circuit, the control laser module of temperature-control circuit 201
6 lasers 204~209 keep stabilized operating temperature, current control circuit in the range of environment temperature -30~60 DEG C in 101
100KHz sinusoidal currents 202 and the road sinusoidal current of 1KHz sawtooth currents 203,6 and 6 road 1KHz sawtooth currents are produced to fold respectively simultaneously
Plus 6 tunnel laser drive currents of composition, 6 lasers 204~209 send required wave-length coverage in driving laser module 101
Detection light.
In a preferred embodiment, beam path alignment array element 103 uses collimator lens array, and each laser is defeated
The light for going out is collimated by a corresponding collimation lens, and AR plated film non-spherical lenses are respectively adopted per collimating lens.This
Utility model is with detection CO, CO simultaneously2、NH3、O2, the composition of beam path alignment array element 103 is illustrated as a example by HC and NO.Such as Fig. 3
Shown, collimation lens of the present utility model is correspondingly arranged at corresponding laser light path exit direction, 6 in laser module 101
The 6 misconvergence of beams light 301~306 that laser 204~209 sends are non-by 6 AR plated films in beam path alignment array element 103 respectively
Spherical lens 307~312 is collimated, the collimated light 313~318 that formation is parallel to each other, and obtains the light beam of a diameter of 5~7cm.
In a preferred embodiment, light path is focused on and filter array unit 104 includes focusing lens array and band logical
Filter arrays, the condenser lens in focusing lens array uses the aspherical focus lamp of AR plated films, is respectively provided with corresponding collimation
The light direction of lens, the bandpass filter in bandpass filter chip arrays is separately positioned on entering for corresponding semiconductor photodetector
Light direction, prevents semiconductor photo detector from being influenceed by veiling glare, focuses on detection light after bandpass filter filtering interfering light
Spectral measurement is carried out on corresponding semiconductor photo detector.The utility model is with detection CO, CO simultaneously2、NH3、O2, HC and NO
As a example by illustrate light path focus on and filter unit composition.As shown in figure 4, through beam path alignment unit outgoing collimated light beam 313~
318 are focused on by the aspherical focus lamp 401~406 of AR plated films respectively, and the light beam 407~412 after focusing is entering semiconductor optoelectronic
Carried out at optical filtering by band pass filter 413~418 respectively before semiconductor photo detector 419~424 in detector group 105
Reason.
In a preferred embodiment, semiconductor light of the semiconductor photo detector group 105 comprising several TEC refrigeration
Electric explorer.Each semiconductor photo detector correspondence detects the detection light that each laser sends.Semiconductor photosensor
In TEC elements ensure photodetector steady operation is kept in the range of environment temperature -30~60 DEG C.
In a preferred embodiment, signal acquisition and processing unit 106 gather semiconductor photo detector group 105
Detection data simultaneously carries out signal amplification and mean filter treatment, then enters horizontal lock amplification and second harmonic is demodulated or once humorous
Ripple is demodulated, while temperature and pressure data in road environment are gathered, and direct absorption spectra data, the gas thing that will be finally given
Kind second harmonic spectrum, the first harmonic spectrum of particulate matter species and temperature, pressure data is activation to computer 111.
As shown in figure 5, above-mentioned motor-vehicle tail-gas remote sensing detection system is based on, it is of the present utility model based on tunable laser
Motor-vehicle tail-gas remote sensing detection method, including herein below：
1st, the infrared second harmonic absworption peak amplitude curve of Theoretical gas is obtained.
Assuming that Theoretical Calibration species of gases concentration is σcalIt is 80% or so of actual measurement concentration maxima, optical path length
It is Lcal, to each species of gases in the laser cardiac wave strong point Fu Yite (Voigt) linear functions -50~100 DEG C and 50~
It is simulated in the range of 120Kpa and is integrated, is calculated each species theory second harmonic and absorb peak amplitude H2,calValue：
In formula, S is gas cardiac wave ν long in the laser0The line absorption intensity at place, vdFor gas, cardiac wave is long in the laser
The doppler linewidth at place, V (x, y) are Fu Yite (Voigt) linear function, vLIt is the long-range navigation of gas cardiac wave strong point in the laser
Hereby line width, above-mentioned these parameters can directly be inquired about in Hitran databases and learnt, be to simplify amount of calculation, and V (x, y) is used
Humlicek simulation formula are described.
2nd, the environmental pressure calibration curve that the infrared second harmonic of Theoretical gas absorbs peak amplitude is obtained.
The temperature of control targe gas keeps constant, and actual measurement concentration is σ under conditions of differential pressurecalGas
Second harmonic absorption peak, to the gas second harmonic absworption peak measured value H for obtaining2,obsWith theoretical amplitude H2,calCarrying out it is many
Item formula fitting, obtains pressure correction curve：
f(P)=a+b*P+c*P2+d*P3+e*P4
In formula, a, b, c, d, e are coefficient of polynomial fitting, and P is real gas gross pressure.
3rd, motor-vehicle tail-gas are detected using motor-vehicle tail-gas remote sense monitoring system, detailed process is：
1) system calibrating
Demarcated using automatic calibration device 107, obtained the calibrating parameters of each species passage.Between the automatic Calibration time
Every being set as 20~30 days, due to being influenceed by open atmospheric temperature pressure change and the atmospheric background value, mainly pass through
It is passed through in mixing gas to the automatic calibration device of concentration known, then detects actually measured signal value, compares with standard value,
Each corridorbarrier function deviation cannot be greater than 5%, specifically be demarcated as prior art, will not be repeated here.
2) background value measurement
(after referring to that front truck passes through, rear car before remote sensing detection by measuring by air background value before for measurement motor vehicle
Atmospheric environment reference background concentration) in each species second harmonic absorb peak amplitude H2,bak。
3) obtain motor vehicle and absorb peak amplitude H through each species of gases second harmonic in light path in 1~2 second time later2,obs
With particulate matter light obscuration.
Motor vehicle is absorbed in 1~2 second time after with each species gases second harmonic in 100Hz frequency measurement light paths
Peak amplitude H2,ob, and calculate particulate matter light obscuration T in air backgroundPM：
In formula, H1,obsIt is motor vehicle warp particulate matter passage first harmonic absorption peak, H in the range of 1~2 second later1,zeroFor
Particulate matter passage first harmonic absorption peak when motor vehicle is in the light, H1,bakIt is the particle of background air when passing through without motor vehicle
Thing passage first harmonic absorption peak.
4) motor vehicle is obtained through each species of gases cigarette group value N in 1~2 second time inner exhaust gas laterobsVariation tendency.
Signal acquisition and processing unit 106 gather the environment temperature and pressure when measuring simultaneously, according to corresponding in step 2
H under temperature and pressure2,calWith pressure correction curve f in step 3(P)Vehicle is calculated through in 1~2 second time inner exhaust gas later
Each species concentration value NobsVariation tendency：
Wherein, σobsIt is each gaseous contaminant concentration, L in light pathobsIt is actual measurement light path；H2,obsAfter passing through for vehicle
The corresponding second harmonic absorption peak of each passage in the light path for obtaining, H are actually measured in 1~2 second2,bakIt is that no motor vehicle passes through
When background air in each passage second harmonic absorption peak.
5) each species concentration is obtained
Value changes trend is rolled into a ball according to each gaseous state cigarette and obtains concentration proportion between each gaseous species using least square fitting,
Each gaseous species and CO are calculated in the present embodiment2Cigarette group is worth ratio, and further according to burning equation, inverse obtains machine in computer 111
Each gaseous species concentration and particle emission factor in motor-car offgas duct, burning equation is：
In formula,CCO、CHC、CNO、CO in petrol and diesel oil tail gas is represented respectively2、CO、HC、NO、NH3Concentration, it is single
Position is %；EFPMIt is the emission factor of exhaust particulate thing, represents the particulate matter quality g numbers that often burning 1Kg fuel oils are discharged；
QCO、QHC、QNO、CO, HC, NO, O in tail gas are represented respectively2Cigarette group is worth and CO2Cigarette group is worth ratio, dimensionless；NCO, NHC
CO in tail gas is represented respectively2, CO and HC cigarette group value, unit is %*cm；γ is particulate matter delustring system at different wavelengths
Number, unit is m2/ g, can directly inquire about from document.
3) acquisition of automobile license plate number and speed/acceleration information
Motor vehicle speed/acceleration analysis module 109, automobile license plate identification module 110 obtain motor vehicle process respectively
When automobile license plate number and speed/acceleration information, and send such information to computer 111.
4th, the output of computer 111 motor-vehicle tail-gas remote sensing detection data, wherein, motor-vehicle tail-gas remote sensing detection data are machine
Each gaseous species concentration and particle emission factor, automobile license plate number and speed/acceleration information in motor-car offgas duct.
The various embodiments described above are merely to illustrate the utility model, wherein the structure of each part, connected mode and manufacture craft
Deng all can be what is be varied from, every equivalents carried out on the basis of technical solutions of the utility model and improvement,
Should not exclude outside protection domain of the present utility model.
Claims (8)
1. a kind of motor-vehicle tail-gas remote sensing detection system based on tunable laser, it is characterised in that the remote exhaust emission is detected
System includes that laser module, laser control module, beam path alignment array element, light path are focused on and filter array unit, half
Conductor photodetector group, signal acquisition and processing unit, optical reflection mirror unit and computer；
The laser control module controls each laser in the laser module to send the inspection of required wave-length coverage respectively
Light-metering；The multi beam detection light that the laser module sends collimates to form collimated light beam simultaneously by the beam path alignment array element
It is transmitted into the optical reflection mirror unit；Under the conditions of open light path, the optical reflection mirror unit will be through motor-driven vehicle
The laser detection light beam of gas reflexes to the light path focusing and filter array unit is focused and filtering process, through the focusing
And the detection light beam of filter array unit outgoing is detected through the semiconductor photo detector group and received and through the signal acquisition
And processing unit is sent to the computer.
2. a kind of motor-vehicle tail-gas remote sensing detection system based on tunable laser as claimed in claim 1, its feature exists
In the number of collimation lens, light path focusing and condenser lens and filter in filter array unit in the beam path alignment array element
In number, the semiconductor photo detector group of mating plate the number of semiconductor photo detector with the laser of the laser module
The number of device is corresponding.
3. the motor-vehicle tail-gas remote sensing detection system of tunable laser is based on as claimed in claim 1, it is characterised in that should
Motor-vehicle tail-gas remote sensing detection system also includes the automatic calibration device for carrying out automatic Calibration to light path, the automatic Calibration
Device is arranged on the focusing and filter array unit outside, and the automatic calibration device electrically connects the computer.
4. the motor-vehicle tail-gas remote sensing detection system of tunable laser is based on as claimed in claim 1, it is characterised in that should
Motor-vehicle tail-gas remote sensing detection system also includes motor vehicle speed/acceleration analysis module and automobile license plate identification module, institute
State motor vehicle speed described in calculating mechatronics/acceleration analysis module measurement and automobile license plate identification module.
5. the motor-vehicle tail-gas remote sensing detection system of tunable laser is based on as claimed in claim 1, it is characterised in that institute
Laser module is stated by several Near-infrared Tunable lasers, middle Laser Regulated in Ultrared Band and ultraviolet light/visible light lasers
Device is constituted, and the type and number of option of species laser are detected for motor-vehicle tail-gas, each detected species correspondence one
Laser.
6. the motor-vehicle tail-gas remote sensing detection system of tunable laser is based on as claimed in claim 2, it is characterised in that institute
State semiconductor photo detector of the semiconductor photo detector using TEC refrigeration.
7. the motor-vehicle tail-gas remote sensing detection system based on tunable laser as described in any one of claim 1~6, it is special
Levy and be, the laser control module includes temperature-control circuit and current control circuit, the temperature-control circuit control
Each laser keeps stabilized operating temperature, the current control in the range of environment temperature -30~60 DEG C in the laser module
Circuit produces sinusoidal current and sawtooth current, sinusoidal current and sawtooth current to be superimposed composition laser drive current respectively simultaneously,
Each laser sends the detection light of required wave-length coverage in driving laser module.
8. the motor-vehicle tail-gas remote sensing detection system based on tunable laser as described in any one of claim 1~6, it is special
Levy and be, the beam path alignment array element uses collimator lens array, and the light of each laser output is by corresponding accurate
Straight lens are collimated, and AR plated film non-spherical lenses are respectively adopted per collimating lens；The light path is focused on and filter array list
Unit includes focusing lens array and bandpass filter chip arrays, and the condenser lens in the focusing lens array is non-using AR plated films
Spherical surface focusing mirror, is respectively provided with the light direction of corresponding collimation lens, the bandpass filter in the bandpass filter chip arrays point
The light direction that enters of corresponding semiconductor photodetector is not arranged on, focuses on detection light after the bandpass filter filtering interfering light
Spectral measurement is carried out on corresponding semiconductor photo detector.
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| CN112748083A (en) * | 2021-01-04 | 2021-05-04 | 安徽中科华仪科技有限公司 | Optical system for remote sensing detection of motor vehicle exhaust |
| CN112763455A (en) * | 2021-01-04 | 2021-05-07 | 安徽中科华仪科技有限公司 | Reflection type multi-light-path multi-wavelength coupling method for remote sensing detection of motor vehicle exhaust |
| CN113959964A (en) * | 2021-10-11 | 2022-01-21 | 天津同阳科技发展有限公司 | Calculation method for detecting carbon dioxide absorption increment based on remote sensing of motor vehicle exhaust |
| CN113959964B (en) * | 2021-10-11 | 2022-05-31 | 天津同阳科技发展有限公司 | Calculation method for detecting carbon dioxide absorption increment based on remote sensing of motor vehicle exhaust |
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