CN109238987B - Multispectral automobile exhaust monitoring devices - Google Patents
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- CN109238987B CN109238987B CN201811186126.7A CN201811186126A CN109238987B CN 109238987 B CN109238987 B CN 109238987B CN 201811186126 A CN201811186126 A CN 201811186126A CN 109238987 B CN109238987 B CN 109238987B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
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- G—PHYSICS
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- G08G1/00—Traffic control systems for road vehicles
Abstract
The invention discloses a multispectral automobile exhaust monitoring device, which comprises a multispectral detection unit, an environment acquisition unit, a vehicle information unit and a main control unit, wherein the multispectral detection unit is used for detecting the vehicle exhaust; the multispectral detection system generates an infrared spectrum and an ultraviolet spectrum of the automobile exhaust; the infrared laser, the ultraviolet laser, the infrared spectrum detector, the ultraviolet spectrum detector, the spectrum analysis module, the environment acquisition unit, the camera, the speed detection module and the acceleration detection module are respectively connected with the main control unit. The invention emits laser to the detection road surface from infrared ultraviolet laser, and forms a multispectral image by corresponding multiband detector, and obtains the tail gas emission data of the road vehicle by analyzing the spectral data. Meanwhile, the corresponding license plate number is identified through an image identification technology, and the license plate number corresponds to the data of exhaust emission, so that the automatic detection of the exhaust of a plurality of automobiles is completed.
Description
Technical Field
The invention relates to automobile exhaust monitoring equipment, in particular to a multispectral automobile exhaust monitoring device.
Background
With the increasing of the number of motor vehicles kept year by year, the influence of the motor vehicle exhaust emission on the atmospheric environment is more and more serious, and the motor vehicle exhaust pollution becomes an important factor influencing the urban air quality. In order to deal with the situation, a plurality of relevant standards are successively provided by the country, clear requirements are made on the limit value of the tail gas emission of the motor vehicle, and vehicles with the tail gas emission which does not reach the standard are not allowed to run on the road. In order to scientifically and accurately detect the exhaust emission of the motor vehicle, strictly control the exhaust emission of the motor vehicle and further increase the pollution control strength of the motor vehicle, the detection of the exhaust pollution of the motor vehicle in use must be strengthened.
At present, the main automobile exhaust detection methods are divided into three types: fixed detection, mobile detection, and remote sensing detection. The fixed detection method is characterized in that automobile exhaust is collected, and then gas component analysis equipment is adopted for detection, so that high detection precision can be achieved, but the fixed detection method is rarely reused due to the fact that the equipment is large in size, complex in detection flow and large in limitation.
The mobile detection method overcomes the defect of large volume of equipment by installing the detection equipment on the vehicle to be detected, has certain progress, but still cannot realize quick installation and real-time monitoring, and the feasibility of installing the detection equipment on each vehicle is not available.
In the remote sensing detection method appearing in recent years, the components of the tail gas are analyzed by measuring the transmissivity of the tail gas to an infrared and ultraviolet band, the method has the characteristic of non-contact real-time performance and is widely applied, but the method requires that a laser transmitting and receiving device and the exhaust position of an automobile are relatively fixed, and has limitation on the detection of a large amount of traffic flows.
The automobile mainly comprises a gasoline automobile and a diesel automobile, the detection standards and modes of the gasoline automobile and the diesel automobile are different, the number of the gasoline automobiles is larger than that of the diesel automobile, the detection standards of the gasoline automobile are measured by detecting the exhaust emission amount of the gasoline automobiles, and the diesel engine is mainly used for measuring the opacity of the exhaust, namely, the opacity or the smoke intensity and the like.
In order to realize simultaneous detection in the prior art, the tail gas content of the gasoline engine is also detected by detecting the light transmittance of the tail gas of the gasoline engine, so that the detection mode is the same as that of the diesel engine. However, the gasoline engine is detected in such a way, so that the detection effect is greatly influenced by the environment, and the detection result is greatly associated with the environment because the diffusion degree of the tail gas discharged by the automobile is different under the conditions of different temperatures, air pressures, wind speeds and rainfall.
Disclosure of Invention
The invention aims to provide a multispectral automobile exhaust monitoring device.
In order to achieve the above object, an embodiment of the present invention provides a multispectral automobile exhaust monitoring device, which comprises
A multispectral detection unit; the multispectral detection unit comprises an infrared laser, an ultraviolet laser, an infrared spectrum detector, an ultraviolet spectrum detector and a spectrum analysis module; the multispectral detection system is used for transmitting infrared and ultraviolet laser signals to the lane road surface to generate an infrared spectrum and an ultraviolet spectrum of the automobile exhaust;
an environment acquisition unit; the system comprises a monitoring system, a monitoring system and a control system, wherein the monitoring system is used for acquiring information parameters of temperature, wind speed, PM value and rainfall in the environment;
a vehicle information unit; the device comprises a camera, a speed detection module and an acceleration detection module; respectively used for acquiring the image, the speed and the acceleration of the vehicle; the camera is installed through a cloud deck;
a main control unit; the system comprises a spectrum analysis module and an image analysis module; the spectrum analysis module is used for analyzing the infrared spectrum and the ultraviolet spectrum to obtain parameter information of carbon oxides, nitrogen oxides and hydrocarbons of tail gas pollutants discharged by the vehicle; the image analysis module is used for acquiring a license plate number from an image of a vehicle;
the infrared laser, the ultraviolet laser, the infrared spectrum detector, the ultraviolet spectrum detector, the spectrum analysis module, the environment acquisition unit, the camera, the speed detection module and the acceleration detection module are respectively connected with the main control unit.
In a preferred embodiment of the present invention, the multi-spectral detection unit further comprises a reflection band.
In one of the preferred embodiments of the present invention, the vehicle information unit is further provided with a light source module disposed at the periphery of the camera for providing a light source for the camera.
In one of the preferred embodiments of the present invention, the camera is mounted above the road, the camera is connected to a video processor, and the video processor transmits the processed signals to the master control unit.
In one preferred embodiment of the present invention, the main control unit is further configured with a communication module, and the communication module is used for realizing communication connection with the vehicle monitoring platform.
In one preferred embodiment of the present invention, the multispectral automobile exhaust monitoring device further comprises an opaque detection unit; the light-tight detection unit comprises an infrared transmitter and an infrared receiver which are respectively arranged on two sides of the road; the infrared emitter and the infrared receiver are connected with a sub-control processor, and the sub-control processor is connected with the main control unit.
In one preferred embodiment of the invention, a main control unit firstly controls a camera to collect images of a vehicle, acquires a license plate number according to the images, sends a query request to a vehicle monitoring platform through a communication module, and receives vehicle information including vehicle types fed back by the vehicle monitoring platform; judging whether the type of the vehicle belongs to a diesel engine or a gasoline engine; when the type of the vehicle is judged to be the condition of the gasoline engine, the main control center controls the multispectral detection unit to detect the exhaust emission of the vehicle; when the type of the vehicle is judged as the diesel engine, the main control center controls the light-tight detection unit to detect the light-tight degree of the tail gas of the diesel engine.
In one preferred embodiment of the invention, the main control unit judges whether the collected parameter information of the vehicle exhaust exceeds the standard or not, binds the parameter information with the acquired license plate number after exceeding the standard, and sends the exceeding information comprising the exhaust parameter information and the license plate number to the vehicle monitoring platform.
In one of the preferable embodiments of the invention, after the vehicle monitoring platform receives the overproof information, the overproof information is stored; searching whether the license plate number in the overproof information has overproof information within the backward pushing time t; and when the excessive information is searched within the backward pushing time t, recording the excessive information as one illegal information, and sending a short message prompt to a user associated with the license plate number.
In summary, the invention has the following advantages:
1. the invention emits laser to the detection road surface from infrared ultraviolet laser, and forms a multispectral image by corresponding multiband detector, and obtains the tail gas emission data of the road vehicle by analyzing the spectral data.
2. Identifying the corresponding license plate number by an image identification technology, and corresponding the license plate number with the data of exhaust emission so as to finish the automatic detection of the exhaust of a plurality of automobiles; the invention can automatically identify the tail gas and monitor speed measurement, violation and the like, has high integration and greatly improves the efficiency of the existing traffic monitoring equipment.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Detailed Description
A multispectral automobile exhaust monitoring device comprises a multispectral detection unit, an environment acquisition unit, a vehicle information unit and a main control unit.
The multispectral detection unit comprises an infrared laser, an ultraviolet laser, an infrared spectrum detector, an ultraviolet spectrum detector and a spectrum analysis module; the multispectral detection system is used for transmitting infrared and ultraviolet laser signals to the roadway surface of the lane and generating infrared spectrums and ultraviolet spectrums of automobile exhaust.
The two spectrums generated by the multispectral detection unit are sent to the spectrum analysis module for analysis processing, and the analysis module can analyze parameters in the automobile exhaust from the spectrums.
An environment acquisition unit; the system is used for collecting information parameters of temperature, wind speed, PM value and rainfall in the environment. The information parameter of the rainfall is the real-time rainfall during measurement, and the rainfall parameter can be obtained through a rainfall sensor.
A vehicle information unit; the device comprises a camera, a speed detection module and an acceleration detection module; respectively used for acquiring the image, the speed and the acceleration of the vehicle; the camera is installed through the cloud platform, and the cloud platform can be installed on the portal frame, sets up directly over the road, and the portal frame also can be convenient for install speed detection module, acceleration detection module etc..
The main control unit comprises a spectrum analysis module and an image analysis module; the spectrum analysis module is used for analyzing the infrared spectrum and the ultraviolet spectrum to obtain parameter information of carbon oxides, nitrogen oxides and hydrocarbons of tail gas pollutants discharged by the vehicle; the image analysis module is used for acquiring the license plate number from the image of the vehicle.
The infrared laser, the ultraviolet laser, the infrared spectrum detector, the ultraviolet spectrum detector, the spectrum analysis module, the environment acquisition unit, the camera, the speed detection module and the acceleration detection module are respectively connected with the main control unit. The main control unit can acquire information acquired by equipment or the module and can control the module to perform acquisition action or send corresponding instructions when needed.
According to the multispectral detection unit, the infrared laser and the ultraviolet laser can be arranged on one portal frame, and the infrared spectrum detector and the ultraviolet spectrum detector are arranged on the other portal frame. The signal emitted by the laser enters the receiving range of the detector after ground reflection or gas diffuse reflection. It is also possible to mount the laser on one side of the road and the detector on the other side.
In an advantageous embodiment of the invention, the multi-spectral detection unit further comprises a reflection band arranged on the road of the detection area, in order to be able to enhance the intensity of the reflected signal of the spectrum.
In an optimized embodiment of the invention, the vehicle information unit is also provided with a light source module, and the light source module is arranged at the periphery of the camera and used for providing light sources for the camera, so that clear shooting and photographing can be performed at night.
In an optimized embodiment of the invention, the camera is arranged above a road, the camera is connected with the video processor, the video processor sends the processed signals to the main control unit, the video processor can obtain screenshots, and the screenshots of the images enter the image analysis unit of the central control unit for processing so as to obtain license plate numbers.
In an optimized embodiment of the invention, the main control unit is also provided with a communication module, and the communication module is used for realizing communication connection with the vehicle monitoring platform.
In an optimized embodiment of the invention, the multispectral automobile exhaust monitoring device further comprises a light-tight detection unit; the light-tight detection unit comprises an infrared transmitter and an infrared receiver which are respectively arranged on two sides of the road; the infrared emitter and the infrared receiver are connected with a sub-control processor, and the sub-control processor is connected with the main control unit.
Opacity N = (1-I/IO). times.100% according to Lambert-Beer's law; wherein I is the intensity of emergent light and IO is the intensity of incident light. The incident light intensity of the infrared transmitter is preset, so that the IO value can be directly obtained according to the preset value, and the emergent light intensity I is the light intensity received by the infrared receiver. The opacity N calculated by the formula is actually the opacity after the form of the smoke plume has changed under the action of the environment. Because the Lambert-Beer experiment condition is that the detection is carried out under the condition that the form, the concentration and the mass of the absorbing substance are not changed in a closed environment, the data detected by the method are actually opaque data after gas diffusion under the action of wind speed, rainfall and the like, and the data are certainly deviated from the data measured by an idling method or a simple working condition method of automobile exhaust. For example, the simple operating condition method is to set a sensor inside the exhaust pipe for measurement, and the sensor is set inside the exhaust pipe so as not to be affected by the wind speed and the like in the environment, that is, the gas does not have a rapid diffusion phenomenon, and the concentration does not decrease.
It is known from the Lambert-Beer law that a decrease in concentration after gas diffusion leads to a decrease in the absorption coefficient, and the calculation of the opacity N value according to the invention is definitely lower. Therefore, when the gas detected by the invention is diffused, the detection data is low, and thus, certain vehicles exceeding the standards can easily escape from the penalty.
From the practical situation, the faster the vehicle speed, the larger the wind speed, the higher the air temperature, the faster the diffusion speed, and the smaller the measured data; when the rainfall is larger, rainwater can partially absorb light in the detection process, so that the measurement data is larger; the larger the air pressure, the slower the molecular diffusion, but the smaller the actual influence, so the influence of the air pressure is not considered. The actual opacity M =1/6 xk of the vehicle according to the invention is therefore1*K2N; wherein K1And K2Is a calibration factor under the influence of an external factor. The inventors have learned the calibration factor K from a number of experiments1Positive correlation is formed between the speed of the vehicle V1 (meter per second), the wind speed V2 and the air temperature T; that is, the greater the vehicle speed V1, wind speed V2 and air temperature T, the greater K1The higher the value, and greater than 1; inversely related to the rainfall P; i.e. the greater the rainfall (mm/m), the greater K2The lower the value, and between 0 and 1.
I.e. the calibration factor
；
Calibration factor
. Because the units of the calibration coefficients are not uniform, the values of the calibration coefficients are based on absolute values and do not contain units, namely, the calculation units are not calculated when each parameter is calculated in the calculation process of the calibration coefficients, and only numerical values are calculated.
And (3) comparison test:
the experiment is carried out in a laboratory, and the test is carried out by selecting the test materials with different temperatures, wind speeds and rainfall at different times. The wind speed can be controlled by a fan, the temperature can be controlled by an air conditioner, and the rainfall is controlled by a spraying device.
Test 1: collecting part of automobile exhaust, and filling the automobile exhaust into the air bag. The air bag is bound on the linear guide rail, so that the air bag can do linear motion along with the guide rail. At the beginning of the test, the linear guideThe rail is operated at a speed to allow the gas within the air-bag to be expelled from the air-bag under pressure. The light-tight detection units are arranged at two sides of the guide rail and are used for detecting gas exhausted by the air bag. Calculating the formula: m =1/6 × K1*K2N; n = (1-I/IO) × 100%. N is a parameter of the opacity measured by the detection unit in test 1.
And (3) testing 2: a generator and a receiver of the opacity detection unit are arranged in a closed container, collected automobile exhaust is filled in the closed environment, then the exhaust in the closed container is detected, in the test 2, a fan and an air conditioner are not started, the temperature is kept at 25 ℃, the automobile exhaust is static, and rainfall is not performed. The test parameters and data are shown in table 1 below. The V1/V2, air temperature, and rainfall parameters in Table 1 are all parameters used in test 1, and are independent of test 2. The calculation formula is as follows: n = (1-I/IO) × 100%. N is the light-tight data measured by the detection unit in test 2.
The same automobile exhaust is adopted in the two groups of tests, the same temperature, air pressure, artificial rainfall and the like are used in the same type of test, wherein V1 is the speed of a linear guide rail, V2 is the wind speed near the guide rail obtained by testing after a fan is started, the unit is m/s, and the unit of the rainfall is millimeter per square meter per day.
Table 1: test 1 test data
| Experimental group | V1 | V2 | Air temperature | Amount of rainfall | K1 | K2 | 1/6*K1*K2 |
| 1 | 5 | 1 | 5 | 2 | 7.38 | 0.87 | 1.07 |
| 2 | 10 | 2 | 5 | 5 | 7.658 | 0.799 | 1.02 |
| 3 | 12 | 3 | 10 | 5 | 7.85 | 0.799 | 1.04 |
| 4 | 20 | 6 | 25 | 15 | 8.357 | 0.702 | 0.975 |
| 5 | 30 | 6 | 30 | 20 | 8.382 | 0.681 | 0.945 |
Wherein C = 1/6K1*K2C is understood to be the overall calibration factor of the detection unit under the influence of the environment when the detection unit is used for detection in an open air environment. As can be seen from table 1, C has a large correlation with the rainfall, the wind speed, and the vehicle speed, and a low correlation with the temperature.
Table 2: test results of test 1 and test 2
| Experimental group | Test 1 | Test 2 |
| 1 | 1.78 | 1.69 |
| 2 | 1.94 | 2.03 |
| 3 | 1.23 | 1.26 |
| 4 | 1.46 | 1.54 |
| 5 | 1.16 | 1.21 |
As can be seen from tables 1 and 2, in each of the tests of experimental group 1 to experimental group 5, the test results of test 1 and test 2 have a certain deviation, but are small. Test 2 is a test conducted in an ideal environment, is not affected by the environment, and therefore the result is accurate. Test 1 was tested under other environmental influences.
As can be seen from table 2, the data of test 1 and test 2 are relatively close, which indicates that test 1 can be relatively close to the accurate data of test 1 after the calibration coefficient is added, and the reliability of the data of the actual test is improved. The calibration coefficient of test 1 can be calculated by the parameters in table 1, and the accuracy can be significantly improved by adding the calibration coefficient. Therefore, the data of the test 1 is very close to the data of the test 2, which shows that the coincidence degree between the detection value and the actual value can be improved after calibration, and the detection can be made to be closer.
In an optimized embodiment of the invention, a main control unit firstly controls a camera to collect images of a vehicle, acquires a license plate number according to the images, sends a query request to a vehicle monitoring platform through a communication module, and receives vehicle information including vehicle types fed back by the vehicle monitoring platform; judging whether the type of the vehicle belongs to a diesel engine or a gasoline engine; when the type of the vehicle is judged to be the condition of the gasoline engine, the main control center controls the multispectral detection unit to detect the exhaust emission of the vehicle; when the type of the vehicle is judged as the diesel engine, the main control center controls the light-tight detection unit to detect the light-tight degree of the tail gas of the diesel engine.
This embodiment of the invention is intended to enable monitoring according to the type of vehicle. The vehicle monitoring platform contains information of all registered vehicles, including license plate numbers, all persons, vehicle time, discharge capacity and fuel models, and can accurately know whether the vehicles belong to gasoline vehicles or diesel vehicles. The vehicle monitoring platform can be a traffic management platform managed by the existing vehicle management; or other platform managed by the traffic administration with vehicle information.
When the vehicle is determined to be a gasoline vehicle, the concentration of pollutants such as nitrogen oxides needs to be monitored, and the pollutants can be detected through spectrum. Similarly, when the vehicle is designated as a diesel vehicle, exhaust pollution monitoring can be achieved by monitoring the opacity, and the pollutants can be detected by the opacity or the transmittance or the transmissivity.
In the optimized embodiment of the invention, the main control unit judges whether the collected parameter information of the vehicle tail gas exceeds the standard or not, binds the parameter information with the acquired license plate number after exceeding the standard, and sends the exceeding information comprising the tail gas parameter information and the license plate number to the vehicle monitoring platform. After the vehicle monitoring platform receives the overproof information, the overproof information is stored; searching whether the license plate number in the overproof information has overproof information within the backward pushing time t; and when the excessive information is searched within the backward pushing time t, recording the excessive information as one illegal information, and sending a short message prompt to a user associated with the license plate number.
According to related regulations, if the data detected by the remote sensing equipment is used for judging whether the vehicle exceeds the standard or not, the vehicle can be determined to be illegal and exceed the standard only if the data is detected once within six consecutive months and is judged to exceed the standard. That is, if the rule is only once within six months, the rule cannot be judged to be out of compliance.
The embodiment is designed according to the regulations, and when the parameter information of the vehicle exhaust collected by the main control unit belongs to the standard exceeding information, the parameter information is bound and then sent to the vehicle monitoring platform, and the vehicle monitoring platform stores the standard exceeding information of all vehicles. According to the information, the vehicle monitoring platform can search by the number plate number, and further can know whether illegal information exists before the monitoring time, namely the backward pushing time. When other illegal overproof information exists, the judgment requirement of the law is met, and the illegal overproof information can be determined.
Claims (7)
1. A multispectral automobile exhaust monitoring device is characterized in that: comprises that
A multispectral detection unit;
the multispectral detection unit comprises an infrared laser, an ultraviolet laser, an infrared spectrum detector, an ultraviolet spectrum detector and a spectrum analysis module; the multispectral detection system is used for transmitting infrared and ultraviolet laser signals to the lane road surface to generate an infrared spectrum and an ultraviolet spectrum of the automobile exhaust;
an environment acquisition unit; the system comprises a monitoring system, a monitoring system and a control system, wherein the monitoring system is used for acquiring information parameters of temperature, wind speed, PM value and rainfall in the environment;
a vehicle information unit; the device comprises a camera, a speed detection module and an acceleration detection module; respectively used for acquiring the image, the speed and the acceleration of the vehicle; the camera is installed through a tripod head;
a main control unit; the system comprises a spectrum analysis module and an image analysis module; the spectrum analysis module is used for analyzing the infrared spectrum and the ultraviolet spectrum to obtain parameter information of carbon oxides, nitrogen oxides and hydrocarbons of tail gas pollutants discharged by the vehicle; the image analysis module is used for acquiring a license plate number from an image of a vehicle;
the infrared laser, the ultraviolet laser, the infrared spectrum detector, the ultraviolet spectrum detector, the spectrum analysis module, the environment acquisition unit, the camera, the speed detection module and the acceleration detection module are respectively connected with the main control unit;
the main control unit firstly controls the camera to collect images of the vehicle, acquires a license plate number according to the images, sends a query request to the vehicle monitoring platform through the communication module, and receives vehicle information including vehicle types fed back by the vehicle monitoring platform; judging whether the type of the vehicle belongs to a diesel engine or a gasoline engine; when the type of the vehicle is judged to be the condition of the gasoline engine, the main control center controls the multispectral detection unit to detect the exhaust emission of the vehicle; when the type of the vehicle is judged as a diesel engine, the main control center controls the light-tight detection unit to detect the light-tight degree of the tail gas of the diesel engine;
the calculation mode of the opacity M is as follows:
n ═ 1-I/IO × 100%; wherein I is the emergent light intensity, and IO is the incident light intensity;
opacity M-1/6K1*K2*N；
Wherein;
calibration factor K1And a calibration factor K2The meaning of each parameter in (a) is as follows:
V1is the speed of the vehicle, V2Wind speed, temperature T and rainfall P;
the main control unit judges whether the collected parameter information of the vehicle exhaust exceeds the standard or not, binds the parameter information with the acquired license plate number after exceeding the standard, and sends the exceeding information comprising the parameter information of the exhaust and the license plate number to the vehicle monitoring platform.
2. The multi-spectral automotive exhaust monitoring device according to claim 1 wherein: the multispectral detection unit further comprises a reflection band.
3. The multi-spectral automotive exhaust monitoring device according to claim 1 wherein: the vehicle information unit is also provided with a light source module which is arranged at the periphery of the camera and used for providing light sources for the camera.
4. The multi-spectral automotive exhaust monitoring device according to claim 1 wherein: the camera is installed above the road, is connected with the video processor, and the video processor sends the signal of handling to the main control unit.
5. The multi-spectral automotive exhaust monitoring device according to claim 1 wherein: the main control unit is also provided with a communication module, and the communication module is used for realizing communication connection with the vehicle monitoring platform.
6. The multi-spectral automotive exhaust monitoring device according to claim 1 wherein: the multispectral automobile exhaust monitoring device also comprises a light-tight detection unit; the light-tight detection unit comprises an infrared transmitter and an infrared receiver which are respectively arranged on two sides of a road; the infrared emitter and the infrared receiver are connected with a sub-control processor, and the sub-control processor is connected with the main control unit.
7. The multi-spectral automotive exhaust monitoring device according to claim 6 wherein: after the vehicle monitoring platform receives the overproof information, the overproof information is stored; searching whether the license plate number in the overproof information has overproof information within the backward pushing time t; and when the excessive information is searched within the backward pushing time t, recording the excessive information as one illegal information, and sending a short message prompt to a user associated with the license plate number.
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