Photo-thermal interferometer for monitoring concentration of particulate matters in atmosphere and monitoring method of photo-thermal interferometer

Abstract

The invention discloses a photo-thermal interferometer for monitoring the concentration of particulate matters in the atmosphere and a monitoring method of the photo-thermal interferometer. The photo-thermal interferometer comprises a laser, a first quarter wave plate, a parallel panel pair, an aerosol chamber, a corner reflecting prism, a modulation laser, a non-depolarization beam splitting prism and a polarization beam splitting prism photoelectric detection device. The monitoring method comprises the steps of filtering sampled air by utilizing filter paper to form dust-containing filter paper, and illuminating the dust-containing filter paper by virtue of modulated laser to cause the variation of surface air temperature and refractive index. If components of the particulate matters in the air are constant, the mass of particulate matters on the filter paper is acquired by measuring the variation of the air refractive index, and the mass of particulate matters on the filter paper is equivalent to the mass concentration of the particulate matters in the air by virtue of a sampling volume.

Description

technical field [0001] The invention relates to the field of atmospheric particle concentration monitoring devices and methods, in particular to a photothermal interferometer and a monitoring method for monitoring the concentration of atmospheric particulate matter. Background technique [0002] Atmospheric particulate matter has a very important impact on climate and human health, especially particulate matter with a particle size of less than 2.5 microns, referred to as PM2.5. It is rich in a large amount of toxic and harmful substances and has a long residence time in the atmosphere and a long transportation distance, so it has a great impact on human health and the quality of the atmospheric environment. PM2.5 is the main reason for the formation of haze weather. PM2.5 is a kind of air pollutant that causes air pollution and is the most serious hazard to human health. At present, there are mainly weighing methods, quartz micro-oscillating balance methods, and Beta ray m...

AI Technical Summary

Problems solved by technology

The weighing method is not suitable for continuous observation; the installation and operation costs of the vibrating balance are high; the Beta ray absorption method can meet the requirements of environmental monitoring, but because the counting value needs to be statistically analyzed, the measurement time is long. For occasions with real-time requirements, such as the environment Pollution reconnaissance, the response time cannot meet the measurement requirements, and the intelligent heating module is required to overcome the influence of humidity on the measurement results

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