CN202794027U - Automobile exhaust remote sensing detection system based on quantum cascade laser device - Google Patents
Automobile exhaust remote sensing detection system based on quantum cascade laser device Download PDFInfo
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- CN202794027U CN202794027U CN201220412566.1U CN201220412566U CN202794027U CN 202794027 U CN202794027 U CN 202794027U CN 201220412566 U CN201220412566 U CN 201220412566U CN 202794027 U CN202794027 U CN 202794027U
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Abstract
The utility model discloses an automobile exhaust remote sensing detection system based on a quantum cascade laser device. A signal generated by any function generator is input into a current pulse driving module of the laser device, the quantum cascade laser device generates intermediate infrared laser or far infrared laser under driving by the current pulse driving module of the laser device, after the intermediate infrared laser or far infrared laser passes through an automobile exhaust emission area, a modulating signal is obtained through a chopper, a pyroelectric sensor module detects a modulated intermediate infrared laser signal or a modulated far infrared laser signal and inputs the detected signal into a phase-locking amplifier for calculation, the phase-locking amplifier outputs data to a computer, and the computer calculates content of different emission products in the automobile exhaust through a data processing analysis method.
Description
Technical field
The utility model belongs to motor vehicle exhaust emission detection technique field, relates in particular to a kind of remote vehicle emissions measurement system based on quantum cascade laser and method.
Background technology
Along with the fast development of China's economy, the automobile pollution sustainable growth, the pollution of harmful waste gas of motor vehicle emission has become one of main source of China's urban atmospheric pollution.According to the statistics of environmental administration, 20% CO in the urban air pollution
2, 60 ~ 70% CO, 40% NO
xCome from vehicle exhaust with 70% HC.For example, Beijing and the ratio of Guangzhou automotive emissions in surrounding air, carbon monoxide (CO) accounts for more than 80%, oxides of nitrogen (NO
x) account for more than 40%.Be the discharging of control automobile exhaust pollution thing, the laws and regulations of restricting vehicle toxic emission have all successively been formulated in countries in the world and area.China comes into effect " light-duty vehicle pollutant emission limit and measuring method (Chinese III, IV the stage) " emission standard that is equivalent to European III rules from July, 2007.But compared with developed countries, the discharging present situation of China's vehicle exhaust still allows of no optimist: the vehicle emission pollution management is started late; The pollution situation that the vehicle exhaust of key cities causes is very serious; Assembly relevant with discharging on the vehicle is short of very much.In order to improve Area Ambient Air Quality, the exhaust emission of cutting down and control vehicle exhaust is own through very urgent.
The monitoring method of the vehicle exhaust that China is existing mainly contains operating condition method and idling method.At present, these two kinds of methods all mainly just can be finished test on the experiment test platform of auto producer or in the vehicle annual test place, and can't realize Real-Time Monitoring for the exhaust emissions process of in the process of moving automobile.In the actual travel process, the exhaust emissions of automobile not only depends on the structure of automobile itself, also depends on the factors such as the degree of crowding of the employed fuel composition of automobile, load, drive manner and traffic.Vehicle exhaust remote sensing monitoring technology is a kind of advanced person's vehicle exhaust monitoring technology, it can the instantaneous discharging to vehicle exhaust realize monitoring in the automobile normal running situation, the pollution vehicle that the identification discharging is not up to standard, for monitoring and the control of city automobile tail gas pollution provides effective means, thereby there is huge social demand to be studied widely and pay close attention to.
The remote-sensing monitoring method of traditional vehicle exhaust mainly is for CO
2, the Non-Dispersive Infra-red (NDIR) method that CO and HC detect.Mostly the testing conditions that discharges pollutants is under the idling condition, can't reflect the characteristic of the Tail Gas discharging of automobile under driving conditions and the photochemical reaction that tail gas may form in air.The automobile exhaust gas checking apparatus of prior art such as the patent No. be CN2440208Y's " a kind of many idling Design of Vehicle Tail Gas Analyzer " flexible pipe need to be connected to the detection analysis that just can carry out CO and HC in the tail gas on the vehicle exhaust mouth of pipe.The patent No. be CN1412541A's " vehicle exhaust being detected in real time infrared laser detection system and the method for usefulness " employed be a kind of Non-Dispersive Infra-red (NDIR) analyser, it does not have spectral resolution, and the tail gas kind that detects is comparatively single, can only detect the concentration of CO and HC.Develop into CO, CO from the detection of single CO and HC concentration
2, HC, NO
x, NH
3And SO
xDetection Deng Multiple components is the direction that current vehicle exhaust remote sensing detects.At present, vehicle exhaust remote sensing detection technique in many countries such as the U.S., Canada, Australia, Sweden, Brazil, Singapore and India all in positive development process.
Quantum cascade laser has been started the beginning of utilizing wide bandgap material development mid and far infrared semiconductor laser, is the milestone of semiconductor laser theory, is just becoming the cutting edge technology that countries in the world fall over each other to follow the trail of.Quantum cascade laser has the advantages such as monochromaticity is good, quantum efficiency is high, temperature stability good, Wavelength design is flexible, intrinsic fast response time.Quantum cascade laser has broad application prospects in the gas context of detection, especially aspect light concentration gas, atmospheric trace gas detection, quantum cascade laser has the unrivaled advantage of conventional semiconductor laser, can be widely used in coal mine mash gas height sensitivity detection, vehicle exhaust and industrial gaseous waste and detect.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, and a kind of remote vehicle emissions measurement system based on quantum cascade laser is provided, and realizes the remote sensing of the motor vehicle emission tail gas that travels on the road is detected.
The technical scheme that its technical matters that solves the utility model adopts is as follows:
The utility model comprises arbitrary-function generator, current impulse driver module, quantum cascade laser, tygon collimation focusing lens, spectroscope, chopper, pyroelectric sensor module, gold-plated corner cube mirror, lock-in amplifier, computing machine;
The voltage signal that arbitrary-function generator produces is input to the current impulse driver module, again by current impulse driver module generation current pulsed drive quantum cascade laser, quantum cascade laser is launched the mid and far infrared laser of which amplitude modulation under the driving of current impulse, mid and far infrared laser is by the parallel outgoing of tygon collimation focusing collimated, parallel mid and far infrared laser is divided into reference path and surveys light path through spectroscope, the mid and far infrared laser of reference path is surveyed by the pyroelectric sensor module of reference path after modulating through chopper, the motor vehicle exhaust emission zone that the mid and far infrared laser of detection light path passes in travelling is reflected by gold-plated corner cube mirror, and the mid and far infrared laser after the reflection is through chopper, detected by the pyroelectric sensor module of surveying light path behind the tygon collimation focusing lens; The sine wave signal component of the pyroelectric sensor module of detection light path, the pyroelectric sensor module of reference path and arbitrary-function generator is inputted in the lock-in amplifier respectively and is carried out related calculation, and lock-in amplifier outputs to computing machine with the result; Computing machine is done additive operation with reference to the related operation output valve of the pyroelectric sensor module of light path with the related operation output valve of the pyroelectric sensor module of surveying light path, and result of calculation carried out the processing of data and the analysis of spectrum, finally obtain the measurement result of vehicle exhaust.
Described spectroscope is arranged on tygon collimation focusing lens dead ahead, and at 45 ° with the light of the parallel outgoing of tygon collimation focusing collimated;
Described arbitrary-function generator produces three kinds of signals: rectangular pulse signal, sawtooth signal and sine wave signal, in arbitrary-function generator inside with input current pulsed drive modules after this three kinds of voltage signals stack, the current impulse driver module drives quantum cascade laser by the rear output of electric current and voltage conversion through the current signal of ovennodulation, arbitrary-function generator is input to related operation that lock-in amplifier carry out signal with the sine wave signal component in the superposed signal in the output superposed signal in the current impulse driver module, lock-in amplifier is connected to computing machine.
Described pyroelectric sensor module comprises pyroelectric sensor, resistance, filter capacitor; 1 pin of pyroelectric sensor connects an end of DC voltage VCC and filter capacitor simultaneously, an end of 2 pin connecting resistances, and the other end of 3 pin and resistance is ground connection simultaneously, and the other end of filter capacitor is connected with lock-in amplifier; Through the input of the AC signal behind filter capacitor lock-in amplifier, the sinusoidal ac signal of simultaneously lock-in amplifier output drives chopper and rotates with certain frequency, and lock-in amplifier is connected to computing machine; Tygon collimation focusing lens and chopper are placed on pyroelectric sensor module dead ahead.
The utility model beneficial effect is as follows:
The first, the voltage signal that the utility model uses arbitrary-function generator to produce drives quantum cascade laser, and quantum cascade laser is launched the mid and far infrared laser of different wave length.Can obtain the very fast spectrum swept-frequency signal of sweep velocity by repetition frequency and the amplitude that changes sawtooth signal in the voltage signal, thereby obtain fast results of spectral measurements.Because the speed of one-shot measurement, therefore the remote vehicle emissions measurement system based on quantum cascade laser can in the driving process of automobile middling speed and low speed, adopt non-contacting mode to measure the vehicle exhaust concentration data under the condition of not disturbing automobile normal running.
The second, quantum cascade laser can be launched the mid and far infrared laser that wavelength can be regulated on a large scale, because the laser frequency spectrum wide coverage of launching, the gaseous species that therefore can measure is more, can finish CO, CO in the one-shot measurement process
2, NO, NO
2, NH
3And SO
2Concentration monitor Deng gas.Owing to only need a quantum cascade laser as spectral radiation source, therefore the remote vehicle emissions measurement system structure based on quantum cascade laser is very simple compact.Simultaneously because mid and far infrared laser for the very high sensitivity of vehicle exhaust composition, therefore can be realized the detection of vehicle exhaust composition sensitivity.
The 3rd, the utility model can be arranged on the different road of width on both sides of the road flexibly according to the road actual conditions.Adjustment is placed on the angle of road gold-plated corner cube mirror on one side, surveys reception so that the mid and far infrared laser parallel that quantum cascade laser is sent reflects by the pyroelectric sensor module.The spectral data disposal route that adopts can realize the data in complex road condition and the emission from vehicles situation are processed and analyzed by intelligent algorithms such as the judgement of ambiguity function degree of membership and artificial neural networks.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is quantum cascade laser driving circuit structure synoptic diagram;
Fig. 3 is pyroelectric sensor module testing circuit structural representation.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of remote vehicle emissions measurement system based on quantum cascade laser comprises arbitrary-function generator 1, current impulse driver module 2, quantum cascade laser 3, tygon collimation focusing lens 4, spectroscope 5, chopper 6, pyroelectric sensor module 7, gold-plated corner cube mirror 8, lock-in amplifier 9, computing machine 10;
The voltage signal that arbitrary-function generator 1 produces is input to current impulse driver module 2, again by current impulse driver module 2 generation current pulsed drive quantum cascade laser 3, quantum cascade laser 3 is launched the mid and far infrared laser of which amplitude modulation under the driving of current impulse, mid and far infrared laser is by the parallel outgoing of tygon collimation focusing lens 4 collimations, parallel mid and far infrared laser is divided into reference path and surveys light path through spectroscope 5, the mid and far infrared laser of reference path is surveyed by the pyroelectric sensor module 7 of reference path after modulating through chopper 6, the motor vehicle exhaust emission zone that the mid and far infrared laser of detection light path passes in travelling is reflected by gold-plated corner cube mirror 8, and the mid and far infrared laser after the reflection is through chopper 6, detected by the pyroelectric sensor module 7 of surveying light path behind the tygon collimation focusing lens 4.The sine wave signal component of the pyroelectric sensor module 7 of detection light path, the pyroelectric sensor module 7 of reference path and arbitrary-function generator 1 is inputted respectively in the lock-in amplifier 9 and is carried out related calculation, and lock-in amplifier 9 outputs to computing machine 10 with the result.Computing machine 10 is done additive operation with reference to the related operation output valve of the pyroelectric sensor module 7 of light path with the related operation output valve of the pyroelectric sensor module 7 of surveying light path, and result of calculation carried out the processing of data and the analysis of spectrum, finally obtain the measurement result of vehicle exhaust.
Described spectroscope 5 is arranged on tygon collimation focusing lens 4 dead aheads, and at 45 ° with the light of the parallel outgoing of tygon collimation focusing lens 4 collimations;
As shown in Figure 2, the voltage signal that arbitrary-function generator 1 produces is by computer control, and produces three kinds of signals and be respectively: rectangular pulse signal, sawtooth signal and sine wave signal; At first, rect.p. is operated under the pulse condition quantum cascade laser, can guarantee that like this working temperature of laser instrument can be too not high; Secondly, sawtooth wave is so that the output wavelength of quantum cascade laser is modulated, and the wavelength variation range of the mid and far infrared of quantum cascade laser output and the amplitude of square wave are directly proportional; At last, sinusoidal wave mid and far infrared laser to output carries out Sine Modulated, so that laser can be surveyed its light intensity by the method for correlation detection, thereby improves signal to noise ratio (S/N ratio) and the sensitivity of surveying; In arbitrary-function generator 1 inside with input current pulsed drive modules 2 after this three kinds of signals stack, current impulse driver module 2 drives quantum cascade laser 3 by the rear output of electric current and voltage conversion through the current signal of ovennodulation, arbitrary-function generator 1 is input to related operation that lock-in amplifier 9 carry out signal with the sine wave signal component in the superposed signal in the output superposed signal in current impulse driver module 2, lock-in amplifier is connected to computing machine 10.
As shown in Figure 3, pyroelectric sensor module 7 comprises pyroelectric sensor 13, resistance 12, filter capacitor 11; 1 pin of pyroelectric sensor 13 connects an end of DC voltage VCC and filter capacitor 11 simultaneously, an end of 2 pin connecting resistances 12, and the other end of 3 pin and resistance 12 is ground connection simultaneously, and the other end of filter capacitor 11 is connected with lock-in amplifier 9; Through the input of the AC signal behind the filter capacitor 11 lock-in amplifier 9, the sinusoidal ac signal of simultaneously lock-in amplifier 9 outputs drives chopper 6 and rotates with certain frequency, and lock-in amplifier 9 is connected to computing machine 10; Tygon collimation focusing lens 4 and chopper 6 are placed on pyroelectric sensor module 7 dead aheads.
Claims (1)
1. the remote vehicle emissions measurement system based on quantum cascade laser comprises arbitrary-function generator (1), current impulse driver module (2), quantum cascade laser (3), tygon collimation focusing lens (4), spectroscope (5), chopper (6), pyroelectric sensor module (7), gold-plated corner cube mirror (8), lock-in amplifier (9), computing machine (10);
The voltage signal that arbitrary-function generator (1) produces is input to current impulse driver module (2), again by current impulse driver module (2) generation current pulsed drive quantum cascade laser (3), quantum cascade laser (3) is launched the mid and far infrared laser of which amplitude modulation under the driving of current impulse, mid and far infrared laser collimates parallel outgoing by tygon collimation focusing lens (4), parallel mid and far infrared laser is divided into reference path and surveys light path through spectroscope (5), the mid and far infrared laser of reference path is surveyed through the rear pyroelectric sensor module (7) by reference path of chopper (6) modulation, the motor vehicle exhaust emission zone that the mid and far infrared laser of detection light path passes in travelling is reflected by gold-plated corner cube mirror (8), and the mid and far infrared laser after the reflection is through chopper (6), detected by the pyroelectric sensor module (7) of surveying light path behind the tygon collimation focusing lens (4); The sine wave signal component of the pyroelectric sensor module (7) of detection light path, the pyroelectric sensor module (7) of reference path and arbitrary-function generator (1) is inputted respectively in the lock-in amplifier (9) and is carried out related calculation, and lock-in amplifier (9) outputs to computing machine (10) with the result; Computing machine (10) is done additive operation with reference to the related operation output valve of the pyroelectric sensor module (7) of light path with the related operation output valve of the pyroelectric sensor module (7) of surveying light path, and result of calculation carried out the processing of data and the analysis of spectrum, finally obtain the measurement result of vehicle exhaust;
Described spectroscope (5) is arranged on tygon collimation focusing lens (4) dead ahead, and at 45 ° with the light of the parallel outgoing of tygon collimation focusing lens (4) collimation;
Described arbitrary-function generator (1) produces three kinds of signals: rectangular pulse signal, sawtooth signal and sine wave signal, inner with these three kinds of rear input current pulsed drive modules (2) of voltage signal stack at arbitrary-function generator (1), current impulse driver module (2) drives quantum cascade laser (3) by the rear output of electric current and voltage conversion through the current signal of ovennodulation, arbitrary-function generator (1) is input to related operation that lock-in amplifier (9) carry out signal with the sine wave signal component in the superposed signal in the output superposed signal in current impulse driver module (2), lock-in amplifier is connected to computing machine (10);
Described pyroelectric sensor module (7) comprises pyroelectric sensor (13), resistance (12), filter capacitor (11); 1 pin of pyroelectric sensor (13) connects an end of DC voltage VCC and filter capacitor (11) simultaneously, one end of 2 pin connecting resistances (12), the other end of 3 pin and resistance (12) is ground connection simultaneously, and the other end of filter capacitor (11) is connected with lock-in amplifier (9); Through the input of the AC signal behind the filter capacitor (11) lock-in amplifier (9), the sinusoidal ac signal of simultaneously lock-in amplifier (9) output drives chopper (6) and rotates with certain frequency, and lock-in amplifier (9) is connected to computing machine (10); Tygon collimation focusing lens (4) and chopper (6) are placed on pyroelectric sensor module (7) dead ahead.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798609A (en) * | 2012-08-20 | 2012-11-28 | 杭州电子科技大学 | Automobile exhaust remote sensing detection system and method based on quantum cascade laser |
| CN106600542A (en) * | 2016-10-31 | 2017-04-26 | 北京空间机电研究所 | Spaceflight optical remote sensing high-density quantization information processing method |
| CN109709078A (en) * | 2018-12-14 | 2019-05-03 | 中国科学院合肥物质科学研究院 | Transmission-type atmospheric visibility measuring device and method based on single-photon detecting survey technology |
| CN116577298A (en) * | 2023-07-07 | 2023-08-11 | 安徽岑锋科技有限公司 | Multi-component high-stability small open-circuit greenhouse gas analyzer |
-
2012
- 2012-08-20 CN CN201220412566.1U patent/CN202794027U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798609A (en) * | 2012-08-20 | 2012-11-28 | 杭州电子科技大学 | Automobile exhaust remote sensing detection system and method based on quantum cascade laser |
| CN106600542A (en) * | 2016-10-31 | 2017-04-26 | 北京空间机电研究所 | Spaceflight optical remote sensing high-density quantization information processing method |
| CN106600542B (en) * | 2016-10-31 | 2020-04-10 | 北京空间机电研究所 | Aerospace optical remote sensing high-density quantization information processing method |
| CN109709078A (en) * | 2018-12-14 | 2019-05-03 | 中国科学院合肥物质科学研究院 | Transmission-type atmospheric visibility measuring device and method based on single-photon detecting survey technology |
| CN109709078B (en) * | 2018-12-14 | 2021-07-06 | 中国科学院合肥物质科学研究院 | Transmission-type atmospheric visibility measuring device and method based on single photon detection technology |
| CN116577298A (en) * | 2023-07-07 | 2023-08-11 | 安徽岑锋科技有限公司 | Multi-component high-stability small open-circuit greenhouse gas analyzer |
| CN116577298B (en) * | 2023-07-07 | 2023-10-03 | 安徽岑锋科技有限公司 | Multi-component high-stability small open-circuit greenhouse gas analyzer |
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