A method and system for detecting the concentration distribution of motor vehicle exhaust HC based on multispectral images

Abstract

The invention relates to a method and system for motor vehicle exhaust HC concentration distribution detection based on multispectral images. The method comprises the steps of establishing a mathematic model of radiance capable of being acquired by a thermal imager; determining relevant parameter values; selecting an appropriate optical filter according to spectral characteristics of different chemical substances; implementing a detection system to collect the multispectral images; and utilizing an electronic computer to process the images to obtain HC concentration distribution. Hardware equipment of the detection system is divided into two kinds: one is a detection system applied to a greenbelt-free lane, wherein the detection system comprises a thermal infrared imager, two optical filters, a galvanized flat plate and an electronic computer; and the other is a detection system applied to a lane with a greenbelt, wherein the detection system comprises a thermal infrared imager, two optical filters and an electronic computer. According to the method and system for motor vehicle exhaust HC concentration distribution detection based on the multispectral images, an implementation mode is simple and convenient, the detection process has no interference to normal operation of traffic, the system is portable and economical, and the exhaust HC concentration distribution can be detected in real time.

Description

technical field [0001] The invention relates to a method and system for detecting the concentration distribution of HC in motor vehicle exhaust based on multispectral images, and belongs to the technical field of motor vehicle tail gas detection. Background technique [0002] With the development of the economy and the improvement of people's living standards, people's awareness of environmental protection has gradually increased and their demand for high quality of life has increased. Due to the development of my country's urbanization and the increase in the number of motor vehicles, motor vehicle exhaust has gradually become the main killer of clean air in cities. About one-fifth of the prefecture-level and above cities in my country suffer from serious air pollution, and as many as one-third of the 113 key cities do not meet the national secondary standard. , the Pearl River Delta and other key areas and major urban agglomerations are major sources of pollution. Therefo...

AI Technical Summary

Problems solved by technology

[0004] The usual detection method for exhaust gas is to analyze it with conventional instruments after sampling, such as the double-idle emission method and the simple working condition method. This type of manual detection cost is high and the cycle is long, and it cannot fully reflect the real emission of exhaust gas; gas chromatograph (Gas Chromatography) sampling detection has high sensitivity and accuracy, but it is expensive and the equipment is bulky. The sampling process cannot avoid errors caused by physical or chemical changes of unstable components in the exhaust gas during sampling.

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