CN210155029U - Full laser motor vehicle exhaust remote sensing detecting system - Google Patents
Full laser motor vehicle exhaust remote sensing detecting system Download PDFInfo
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- CN210155029U CN210155029U CN201920467514.6U CN201920467514U CN210155029U CN 210155029 U CN210155029 U CN 210155029U CN 201920467514 U CN201920467514 U CN 201920467514U CN 210155029 U CN210155029 U CN 210155029U
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Abstract
The utility model relates to a full laser motor vehicle tail gas remote sensing detecting system, a serial communication port, this detecting system includes: the laser emission device is used for emitting beam combination light within the wavelength range of each tail gas component to the motor vehicle to be tested; the optical reflection device is used for reflecting beam combining light which carries a tail gas signal after passing through the tail gas smoke mass of the motor vehicle to be detected; the tail gas receiving device is used for receiving the reflected beam combining light carrying the tail gas signals and processing the beam combining light to obtain second harmonic signals of all tail gas components; the industrial computer is connected tail gas receiving arrangement, the utility model discloses can the wide application in the remote sensing field.
Description
Technical Field
The utility model relates to a motor vehicle exhaust detecting system especially is about a full laser motor vehicle exhaust remote sensing detecting system.
Background
With the continuous and rapid development of economy, motor vehicles keep a high-speed growth situation, further air pollution is caused, and the quantity of motor vehicles in China reaches 2.9 hundred million vehicles, wherein 1.94 hundred million vehicles are kept by the end of 2016 statistically. 3 hundred million cars are broken through for the first time at the end of 3 months in 2017, and 2 hundred million cars are obtained. The tail gas pollution of motor vehicles becomes a main source of air quality hazards, and is an important reason for frequent haze. The research results show that the urban motor vehicle exhaust gases CO, HC and NOXThe amount of emissions of (a) is 60% -70%, 40% -50% and 30% -40% of the total pollutants in the city, and shows a rising trend with the increase in the number of motor vehicles, more than half of which is derived from the emissions of highly polluted vehicles accounting for less than 20% of the total number of motor vehicles. Therefore, strengthening the work of preventing and controlling the tail gas pollution of the motor vehicle, especially strengthening the work of supervising the tail gas emission of the motor vehicle, is an important means for controlling the tail gas emission of the motor vehicle. The continuous increase of the quantity of the motor vehicles makes the motor vehicle tail gas remote sensing detection system gradually become an important means for monitoring the vehicle tail gas emission, and the tail gas remote sensing monitoring can be implemented on the motor vehicles running on the road under the condition of not influencing traffic, so that high-emission vehicles can be screened out. Along with the gradual reduction of highly polluted vehicles, the emission of tail gas of motor vehicles running on the road is gradually reduced, so that higher requirements on the detection capability, the detection limit value and the accuracy of the remote sensing detection system are provided.
As for light sources, the prior art discloses a method for detecting CO and CO in exhaust gas by using an NDIR (non-dispersive infrared) lamp as a continuous light source2And HC; detecting NOx in the tail gas by using an ultraviolet lamp as a light source and adopting DUV (non-dispersive ultraviolet spectrum); the near-infrared tunable laser diode is used as a light source, and TDLAS (tunable diode laser absorption spectroscopy) is adopted to detect CO and CO in tail gas2(ii) a Or a method for detecting HC and NO in exhaust gas by DOAS (differential absorption Spectroscopy) with an ultraviolet lamp as a light source, whereinThe ultraviolet lamp can be used as a light source and can be combined with other methods such as DOAS and the like to detect NO2, SO2, NH3 and the like in tail gas. However, the detection of exhaust gas by a remote sensing system of a motor vehicle belongs to an open system, and each component is influenced by temperature in the real-time detection process, so that the NDIR and DOAS methods are required to be calibrated every two hours or so. Meanwhile, infrared detection is a broad-spectrum light source by using infrared as a light source, and the light source is still a broad-spectrum light source even passing through an optical filter, and has the defects of poor selectivity and low sensitivity.
The method is characterized in that the remote sensing detection system is an open system, the process of the motor vehicle tail gas emission is a real-time dynamic diffusion process and a gradual dilution process, and the method is to assume that the relative ratio among the tail gas components is kept unchanged in a short time (less than 1s), namely the tail gas components are almost synchronously diffused in the short time. However, the method is influenced by the position of each laser, namely the optical structural component, the detection light emitted by each component laser passes through different positions of the tail gas smoke mass, the actual effective optical path is different, and great errors are brought to the measurement result.
Disclosure of Invention
To the problem, the utility model aims at providing a high and little full laser motor vehicle exhaust remote sensing detecting system of error of sensitivity.
In order to achieve the purpose, the utility model adopts the following technical proposal: a full laser remote sensing detection system for motor vehicle exhaust, comprising: the laser emission device is used for emitting beam combination light within the wavelength range of each tail gas component to the motor vehicle to be tested; the optical reflection device is used for reflecting beam combining light which carries a tail gas signal after passing through the tail gas smoke mass of the motor vehicle to be detected; the tail gas receiving device is used for receiving the reflected beam combining light carrying the tail gas signals and processing the beam combining light to obtain second harmonic signals of all tail gas components; and the industrial personal computer is connected with the tail gas receiving device.
Preferably, the detection system further comprises a license plate recognition device, a speed measurement device, a weather station and a display device; the license plate recognition device, the speed measuring device, the weather station and the display device are further respectively connected with the industrial personal computer.
Preferably, the license plate recognition device comprises a camera and a video recorder; the camera and the video recorder are respectively connected with the industrial personal computer.
Preferably, the laser emitting apparatus includes: the laser group comprises a plurality of lasers, and the lasers are used for emitting detection light within the wavelength range of corresponding tail gas components; the laser control unit is respectively connected with each laser; the detection gas cell is arranged on the light path of the detection light and used for containing standard gas with known concentration; and the multi-wavelength light beam coupling unit is used for combining the detected lights and generating combined light.
Preferably, the laser control unit comprises a temperature control device and a current control device; the temperature control device and the current control device are respectively connected with each laser.
Preferably, the laser group comprises a plurality of TEC refrigerated near infrared tunable lasers, a middle infrared tunable laser and a plurality of visible lasers.
Preferably, the exhaust gas receiving device comprises: the light filtering array unit comprises a plurality of light filters which are arranged in parallel and used for splitting and filtering the combined light carrying tail gas signals or standard gas signals with different wavelengths; the semiconductor photoelectric detector group comprises a plurality of semiconductor photoelectric detectors, and the semiconductor photoelectric detectors are used for detecting beam-combined optical signals carrying tail gas signals or standard gas signals with corresponding wavelengths after filtering; and the signal acquisition and processing unit is respectively connected with the semiconductor photoelectric detector group and the industrial personal computer.
Preferably, each of the half semiconductor photodetectors is a semiconductor photodetector cooled by a TEC, and the number of the semiconductor photodetectors is the same as that of the lasers.
Preferably, the speed measuring device adopts a multi-lane microwave radar speed measuring instrument.
Preferably, the optical reflection device adopts a reflector or an optical reflection aluminum plate.
The utility model discloses owing to take above technical scheme, it has following advantage: 1. the utility model adopts NO, CO and CO as light sources2The line width of each type of laser tunable for tail gas components of motor vehicles such as HC and the like is very narrow and is far smaller than the absorption line width of the tail gas components, the laser is a light source with single frequency, the frequency of the light source can be consistent with the absorption frequency of gas molecules of the tail gas, and the laser has good relative broad-band absorption selectivity and high sensitivity. 2. The utility model discloses a laser emission device is provided with multi-wavelength light beam coupling unit, can improve measuring result's correlation, and scanning receiving and dispatching integral type is measured, and the regulation of the light path of being convenient for, no matter the height of actual motor vehicle blast pipe, the cigarette group that obtains exhaust emissions all can be surveyed, has also improved detecting system's stability and shock resistance simultaneously. 3. The utility model discloses well laser emission device sends detects the light is the visible light, launches optical reflection device on, and it is convenient to bring adjusting luminance of tail gas receiving arrangement, can reduce the time of adjusting luminance, can wide application in the remote sensing field of detecting.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic view of the exhaust gas detection principle of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings. It is to be understood, however, that the drawings are provided for a better understanding of the invention and that they are not to be interpreted as limiting the invention.
As shown in fig. 1, the utility model provides a full laser motor vehicle exhaust remote sensing detection system includes license plate recognition device 1, speed sensor 2, laser emission device 3, optical reflection device 4, tail gas receiving arrangement 5, weather station 6, industrial computer 7 and display device 8.
The license plate recognition device 1 is used for acquiring images of a head and a tail of a motor vehicle to be detected when the motor vehicle passes through a tail gas detection point, combining two images with obvious displacement into one image, and the license plate recognition device 1 is also used for acquiring video data of the motor vehicle to be detected in 4s before and after the motor vehicle passes through the tail gas detection point, and sending the combined image and the video data to the industrial personal computer 7.
The speed measuring device 2 is used for measuring the speed and the acceleration of the motor vehicle to be measured when the motor vehicle passes through the tail gas detection point, and the speed and the acceleration are sent to the industrial personal computer 7 through the converter.
The laser emitting device 3 is used for emitting beam combination light within the wavelength range of each tail gas component to the motor vehicle to be tested.
The optical reflection device 4 is used for reflecting beam combining light which carries tail gas signals after passing through a tail gas smoke cluster of the motor vehicle to be detected.
The tail gas receiving device 5 is used for receiving the reflected beam combination light carrying the tail gas signal, processing the beam combination light to obtain a second harmonic signal of each tail gas component, and then sending the second harmonic signal to the industrial personal computer 7 in a wireless or wired mode.
The meteorological station 6 is used for obtaining the environmental parameters of the tail gas detection point, including ambient temperature, humidity, pressure, wind power, wind direction and GPS data, and sends to the industrial personal computer 7 through the wired mode.
The industrial personal computer 7 is used for calculating the concentration of each tail gas component of the motor vehicle to be tested according to the obtained second harmonic signal, and determining the tail gas emission result of the motor vehicle to be tested according to the preset concentration threshold value of each tail gas component.
The display device 8 is used for displaying the combined image and the exhaust emission result of the motor vehicle to be tested in real time.
As shown in fig. 2, the laser emitting device 3 includes a laser group 31, a laser control unit 32, a multi-wavelength beam coupling unit 33, and an assay gas cell, wherein the laser group 31 includes several lasers 311. Each laser 311 in the laser group 31 is connected to the laser control unit 32. The laser control unit 32 is configured to control each laser 311 to emit detection light within a specific wavelength range of each exhaust component. The calibration gas cell is disposed in the optical path of the detection light so that the detection light emitted from the laser group 31 can pass through the calibration gas cell and be reflected by the optical reflection device 4 to the exhaust gas receiving device 5. The verification gas pool is used for containing standard gas with known concentration, namely standard gas. The multi-wavelength light beam coupling unit 33 is used for combining the detected lights and generating a combined light beam, and the combined light beam passes through a tail gas smoke group discharged by the motor vehicle to be detected or standard gas in a detection gas pool under an open light path and is reflected to the tail gas receiving device 5 through the optical reflection device 4. Before dynamic test or static test of the tail gas detection of the motor vehicle to be detected, the industrial personal computer 7 can be calibrated through the verification gas pool, so that errors caused by temperature and pressure changes are reduced.
In a preferred embodiment, the laser group 31 includes a plurality of TEC-refrigerated near-infrared tunable lasers 311, a mid-infrared tunable laser 311, and a plurality of visible lasers 311, the type and number of the lasers 311 can be selected according to the exhaust gas component of the vehicle to be tested, each laser 311 corresponds to an exhaust gas component, wherein the exhaust gas component CO is2The wavelengths corresponding to CO, NO and CH are respectively 2004nm, 2326nm, 5263nm and 3370nm, the wavelengths respectively correspond to the fundamental frequency absorption bands of various species, and a laser 311 with visible light of 550nm is adopted for detecting the particles in the tail gas.
In a preferred embodiment, the laser control unit 32 comprises a temperature control device and a current control device, which are connected to each laser 311, respectively. The temperature control device is used for controlling each laser 311 to maintain a stable working temperature in a range with large change of the environmental temperature, and the current control device is used for generating a driving current and driving each laser 311 to emit detection light in a required wavelength range. The temperature control device and the current control device work together to ensure that each laser 311 in the laser group 31 emits stable detection light within the wavelength range of the exhaust gas component, and the detection light is greatly influenced by temperature and current.
In a preferred embodiment, the exhaust gas receiving device 5 includes a filter array unit 51, a semiconductor photodetector group 52 and a signal collecting and processing unit 53, where the filter array unit 51 includes a plurality of filters arranged in parallel, the filters are used for filtering light corresponding to specific wavelengths, and the semiconductor photodetector group 52 includes a plurality of semiconductor photodetectors, each of which may adopt a semiconductor photodetector refrigerated by a TEC (semiconductor cooler). The filter array unit 51 is configured to split the combined beam light carrying the tail gas signals or the standard gas signals with different wavelengths into light with respective wavelengths, and filter out corresponding stray light to obtain the combined beam light carrying the tail gas signals or the standard gas signals after filtering. The semiconductor photodetector group 52 is used for detecting a combined light signal carrying different wavelength exhaust signals or standard gas signals after filtering. The signal acquisition and processing unit 53 is used for amplifying and filtering the beam combination optical signal, extracting the second harmonic signal of each tail gas component or standard gas and sending the second harmonic signal to the industrial personal computer 7.
In a preferred embodiment, the number of semiconductor photodetectors within the semiconductor photodetector group 52 is the same as the number of lasers 311.
In a preferred embodiment, the license plate recognition apparatus 1 comprises a camera and a video recorder. The camera and the video recorder are respectively connected with the industrial personal computer 7, and the camera is used for collecting images of license plates of the head and the tail of the vehicle and vehicle body colors when the motor vehicle to be detected passes through the tail gas detection point, combining two images with obvious displacement into one image and respectively sending the image to the industrial personal computer 7. The video recorder is used for collecting video data of the motor vehicle to be detected in 4s before and after the motor vehicle passes through the tail gas detection point and sending the video data to the industrial personal computer 7.
In a preferred embodiment, the speed measuring device 2 can be a multi-lane microwave radar speed measuring instrument.
In a preferred embodiment, the optical reflection device 4 may use a mirror 41 or an optical reflection aluminum plate.
In a preferred embodiment, the weather station 6 is an integrated micro weather station.
In a preferred embodiment, a calibration curve determining module, a calibration coefficient determining module, an exhaust gas concentration calculating module, a result determining module, an alarm module and a data storage module are arranged in the industrial personal computer 7. And the calibration curve determining module is used for obtaining a calibration curve according to the second harmonic signals of the standard gases with different known concentrations and the corresponding known concentrations. The calibration coefficient determining module is used for determining a calibration coefficient according to a second harmonic signal of a standard gas with a known concentration, a calibration curve and the known concentration of the standard gas, wherein a ratio obtained by dividing the known concentration of the standard gas by the measured concentration of the standard gas is the calibration coefficient. And the tail gas concentration calculation module is used for obtaining the concentration of each tail gas component of the motor vehicle to be detected according to the second harmonic signal, the calibration curve and the calibration coefficient of each tail gas component. The result determining module is used for judging whether the exhaust emission of the motor vehicle to be tested exceeds the standard or not according to the calculated concentration of each exhaust component of the motor vehicle to be tested and the preset concentration threshold of each exhaust component, if so, sending an alarm signal to the alarm module, and sending the exhaust emission result to the display device 8 for displaying. The alarm module is used for alarming according to the alarm signal. The data storage module is used for storing the concentration (including the opacity) of each tail gas component of the motor vehicle to be detected, the image and video data of the motor vehicle to be detected, the speed and the acceleration of the motor vehicle to be detected when the motor vehicle to be detected passes through the tail gas detection point and the environmental parameters of the tail gas detection point in real time.
In a preferred embodiment, the display means 8 is a highlighted dot matrix screen.
The utility model discloses full laser motor vehicle exhaust remote sensing detecting system's use is explained in detail through specific embodiment below:
1) system calibration: before the detection of the tail gas of the motor vehicle to be detected, standard gases with different known concentrations are respectively introduced into a detection gas pool, a laser group 31 sends detection light in the wavelength range of each tail gas component to the detection gas pool, a multi-wavelength light beam coupling unit 33 enables each detection light to be combined and generates combined light, the standard gas passing through the detection gas pool under an open light path is emitted to an optical reflection device 4, the optical reflection device 4 sequentially reflects the combined light which passes through the standard gas in the detection gas pool and carries a corresponding standard gas signal, a semiconductor photoelectric detector group 52 respectively detects the combined light signal which carries the standard gas signal after being filtered by a light filtering array unit 51, after a second harmonic signal of each standard gas with the known concentration is obtained by amplifying and filtering by a signal acquisition processing unit 53, an industrial computer 7 performs linear fitting on the second harmonic signals sent to the standard gases with the different known concentrations and the corresponding known concentrations, and after a calibration curve is obtained, discharging the standard gas out of the calibration gas pool.
2) The license plate recognition device 1 acquires images of a head and a tail of a motor vehicle to be detected when the motor vehicle to be detected passes through a tail gas detection point and video data of the motor vehicle to be detected in 4s before and after the motor vehicle passes through the tail gas detection point.
3) The speed measuring device 2 measures the speed and the acceleration of the motor vehicle to be measured when the motor vehicle passes through the tail gas detection point.
4) The weather station 6 acquires environmental parameters of the tail gas detection point.
5) The tail gas receiving device 5 receives beam combining light carrying tail gas signals, which is reflected by the optical reflection device 4 after detection light sequentially passes through the detection gas pool (empty) and the motor vehicle tail gas smoke mass to be detected, and the beam combining light is processed to obtain second harmonic signals of all tail gas components and then is sent to the industrial personal computer 7.
6) The industrial personal computer 7 brings the second harmonic signal of a certain standard gas with known concentration into a calibration curve to obtain the measured concentration of the corresponding standard gas, and determines a calibration coefficient according to the measured concentration and the known concentration of the standard gas.
7) The industrial personal computer 7 brings the second harmonic signals of the tail gas components into a calibration curve to obtain the measured concentrations of the corresponding tail gas components, and multiplies the measured concentrations of the tail gas components by calibration coefficients respectively to obtain the concentrations of the tail gas components of the motor vehicle to be measured.
8) The industrial personal computer 7 determines the exhaust emission result of the motor vehicle to be detected according to the preset concentration threshold value of each component. And if the exhaust emission of the motor vehicle to be detected exceeds the standard, alarming.
9) The industrial personal computer 7 stores the concentration (including opacity) of each tail gas component of the motor vehicle to be tested, the image and video data of the motor vehicle to be tested, the speed and acceleration of the motor vehicle to be tested when the motor vehicle passes through the tail gas detection point and the environmental parameters of the tail gas detection point in real time, and is used for the department of traffic control to obtain evidences.
Above-mentioned each embodiment only is used for explaining the utility model discloses, wherein structure, connected mode and the preparation technology etc. of each part all can change to some extent, all are in the utility model discloses equal transform and improvement of going on technical scheme's the basis all should not exclude outside the protection scope of the utility model.
Claims (10)
1. A full laser remote sensing detection system for motor vehicle exhaust, comprising:
the laser emission device is used for emitting beam combination light within the wavelength range of each tail gas component to the motor vehicle to be tested;
the optical reflection device is used for reflecting beam combining light which carries a tail gas signal after passing through the tail gas smoke mass of the motor vehicle to be detected;
the tail gas receiving device is used for receiving the reflected beam combining light carrying the tail gas signals and processing the beam combining light to obtain second harmonic signals of all tail gas components;
and the industrial personal computer is connected with the tail gas receiving device.
2. The full laser remote sensing system for detecting the motor vehicle exhaust according to claim 1, wherein the system further comprises a license plate recognition device, a speed measurement device, a weather station and a display device;
the license plate recognition device, the speed measuring device, the weather station and the display device are further respectively connected with the industrial personal computer.
3. The laser-based remote vehicle emissions detection system of claim 2 wherein said license plate recognition means comprises a camera and a video recorder;
the camera and the video recorder are respectively connected with the industrial personal computer.
4. The full laser remote sensing system for detecting vehicle exhaust according to claim 1, wherein said laser emitting device comprises:
the laser group comprises a plurality of lasers, and the lasers are used for emitting detection light within the wavelength range of corresponding tail gas components;
the laser control unit is respectively connected with each laser;
the detection gas cell is arranged on the light path of the detection light and used for containing standard gas with known concentration;
and the multi-wavelength light beam coupling unit is used for combining the detected lights and generating combined light.
5. The full laser remote sensing system for detecting vehicle exhaust according to claim 4, wherein the laser control unit comprises a temperature control device and a current control device;
the temperature control device and the current control device are respectively connected with each laser.
6. The full laser remote sensing system for detecting motor vehicle exhaust of claim 4, wherein the laser set comprises a plurality of TEC refrigerated near infrared tunable lasers, a middle infrared tunable laser and a plurality of visible lasers.
7. The laser remote sensing system for detecting vehicle exhaust as claimed in claim 4 wherein said exhaust receiving means comprises:
the light filtering array unit comprises a plurality of light filters which are arranged in parallel and used for splitting and filtering the combined light carrying tail gas signals or standard gas signals with different wavelengths;
the semiconductor photoelectric detector group comprises a plurality of semiconductor photoelectric detectors, and the semiconductor photoelectric detectors are used for detecting beam-combined optical signals carrying tail gas signals or standard gas signals with corresponding wavelengths after filtering;
and the signal acquisition and processing unit is respectively connected with the semiconductor photoelectric detector group and the industrial personal computer.
8. The all-laser remote sensing system for detecting vehicle exhaust gas of claim 7, wherein each semiconductor photodetector is a semiconductor photodetector cooled by a TEC, and the number of the semiconductor photodetectors is the same as that of the lasers.
9. The full laser remote sensing system for detecting the tail gas of the motor vehicle as claimed in claim 2, wherein the speed measuring device adopts a multi-lane microwave radar speed measuring instrument.
10. The all-laser remote vehicle exhaust gas sensing system according to any one of claims 1 to 9, wherein the optical reflection device is a mirror or an optical reflection aluminum plate.
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| CN201920467514.6U CN210155029U (en) | 2019-04-09 | 2019-04-09 | Full laser motor vehicle exhaust remote sensing detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983146A (en) * | 2020-08-17 | 2020-11-24 | 三河市清源绿创环境技术股份有限公司 | Motor vehicle exhaust monitoring system |
| CN113049037A (en) * | 2021-03-16 | 2021-06-29 | 交通运输部天津水运工程科学研究所 | Intelligent monitoring system and method for ship with excessive tail gas |
| CN113984967A (en) * | 2021-10-25 | 2022-01-28 | 河北先河环保科技股份有限公司 | Ship tail gas monitoring method, device, system, terminal and storage medium |
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2019
- 2019-04-09 CN CN201920467514.6U patent/CN210155029U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983146A (en) * | 2020-08-17 | 2020-11-24 | 三河市清源绿创环境技术股份有限公司 | Motor vehicle exhaust monitoring system |
| CN113049037A (en) * | 2021-03-16 | 2021-06-29 | 交通运输部天津水运工程科学研究所 | Intelligent monitoring system and method for ship with excessive tail gas |
| CN113049037B (en) * | 2021-03-16 | 2022-07-29 | 交通运输部天津水运工程科学研究所 | Intelligent monitoring system and method for ship with excessive tail gas |
| CN113984967A (en) * | 2021-10-25 | 2022-01-28 | 河北先河环保科技股份有限公司 | Ship tail gas monitoring method, device, system, terminal and storage medium |
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