Laser self-mixing multi-physical parameter measurement method and device for atmospheric particulate

Abstract

The invention discloses a laser self-mixing multi-physical parameter measurement method and a laser self-mixing multi-physical parameter measurement device for an atmospheric particulate. The laser self-mixing multi-physical parameter measurement device comprises a microchip laser, a collimating lens, a beam splitter, converging lenses, a photodetector, an amplifier, a data acquisition card and a spectrum analyzer. Laser emitted by the microchip laser is focused onto the atmospheric particulate to be measured through the collimating lens and the converging lens, and part of generated backwards-scattered light is fed back to the laser due to the reversibility principle of an optical path, so that parameters such as power and wavelength of the laser are changed, namely a laser self-mixing effect is achieved. In addition, the beam splitter is additionally arranged in the optical path to split a small part of laser beam for the photodetector to receive, and a laser self-mixing signal is acquired and analyzed by the amplifier, the data acquisition card and the spectrum analyzer. The laser self-mixing multi-physical parameter measurement device has a simple structure, and is easy to regulate; and the detection accuracy of an atmospheric particulate detection device is effectively improved.

Description

technical field [0001] The invention relates to the technical field of atmospheric particle monitoring, in particular to a rapid non-contact measurement method and device for multiple physical parameters of atmospheric particles. Background technique [0002] With the continuous development of the economy, particulate matter pollution has become the primary pollution source of the atmosphere. Atmospheric particulate matter concentration, particle size and movement speed, as important parameters that affect and characterize atmospheric air quality, have attracted more and more attention. Particulate matter in urban air mainly comes from soil wind and dust, industrial flue gas, construction dust, motor vehicle exhaust dust, etc., which have very serious harm to the ecological environment, industrial production, human health and other fields. Atmospheric particulate matter can absorb or reflect solar radiation, disturb the natural energy radiation balance, and reduce at...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for measuring multi-physical parameters of laser self-mixing atmospheric particles to solve the problems of complex detection structure and low measurement accuracy in the existing measurement technology for the microphysical characteristic parameters of atmospheric particles

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