Reflective multi-light-path multi-wavelength coupling method for remote sensing detection of motor vehicle exhaust

Abstract

The invention discloses a reflective multi-light-path multi-wavelength coupling method for remote sensing detection of motor vehicle exhaust, which comprises the following steps of: combining collimated light beams by laser light sources with different wavelengths in each channel through a multi-surface reflecting cone, and simultaneously, realizing beam expansion and collimation optimization of coupled light beams by using a confocal concave reflecting mirror and a convex reflecting mirror; and finally, reflecting and outputting the light by the reflector. According to the invention, multi-beam multi-wavelength small-diameter high-precision light beam coupling is realized by adopting the multi-surface reflection cone of which the surface is plated with the metal film, high integration of a system light path structure is facilitated, and limitation of a lens film layer process and wave bands of a conventional infrared transmission type coupling scheme can be avoided by adopting the reflection type structure; and the material absorption loss of the transmission-type coupling structure can be avoided, the coupling efficiency is higher, the service life of the film layer is longer, and the spectrum application range is wider.

Description

technical field [0001] The invention relates to the technical field of remote sensing detection of motor vehicle exhaust, in particular to a reflective multi-optical path multi-wavelength coupling method for remote sensing detection of motor vehicle exhaust. Background technique [0002] With the rapid development of the economy, motor vehicle exhaust pollution has become one of the important urban pollution, which seriously affects the urban air quality. In 2016, the "Law of the People's Republic of China on the Prevention and Control of Air Pollution" clearly stipulates that roads can be driven without affecting the driving conditions of vehicles. Vehicles are tested for non-contact exhaust emissions. In 2017, the Ministry of Environmental Protection compiled and released the relevant restrictions and testing methods for remote sensing testing of motor vehicles. In the same year, RJ845-2017 was issued to clearly specify the measurement methods and technical requirements for...

AI Technical Summary

Problems solved by technology

In the all-laser exhaust remote sensing detection system, multiple lasers are used to realize the simultaneous measurement of multi-component exhaust gas. , high environmental adaptability and larger exhaust plume coverage, it is necessary to use a wide-diameter high-precision coupling beam. The prior art has published a large-spot beam coupling form based on different types of lenses. This lens-based coupling The form and stability of the lens will be largely limited by the coating process of the lens, the spectral adaptability is not strong, and the coupling method based on the lens will bring a certain amount of lens absorption loss, which is not conducive to high integration, long-distance and high-precision exhaust gas Implementation of the measurement system

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