Simulated telemetry system and method for infrared extinction and particle size of bio-aerosol

Abstract

The invention discloses a simulated telemetry system and a simulated telemetry method for infrared extinction and particle size of bio-aerosol. According to the system, an aerosol generator fills sample powder in a sample cell, the sample powder is fully dispersed by a fan to form a bio-aerosol cloud, the size distribution of particles is measured by a spectrometer, black body radiation generated by a large surface source black body radiation source positioned at a light inlet of the sample cell is used for simulating ground feature long wave radiation, and the light is attenuated by the sample cell, and is received by a medium field receiving telescope and a Fourier conversion infrared spectrometer which are positioned at the light outlet of the sample cell, so that the bio-aerosol cloud is subjected to infrared extinction measurement and telemetry simulation under typical ground feature backgrounds. The simulated telemetry system has a simple structure, is used for telemetry simulation of the spectrum extinction and size distribution of the aerosol under the laboratory conditions, and verifies a bio-aerosol infrared telemetry technology; and the invention is easy to operate, reliable and stable, and can simultaneously measure multiple components and multiple optical parameters.

Description

[0001] technical field [0002] The invention relates to the field of environmental detection technology and analysis and optics, in particular to a simulation telemetry system and method for infrared extinction and particle diameter of biological aerosol. Background technique [0003] Bioaerosols usually refer to active biological substances suspended in gas with a particle size between 100nm and 100μm, including viruses, bacteria, fungi, pollen and their by-products, etc. Among the existing analysis methods, the measurement of bioaerosol has higher requirements on the sampling process. The traditional physical aerosol sampling process is difficult to maintain the biological activity of bioaerosols. Factors such as dehydration, ultraviolet radiation, and temperature changes also make the sampling and analysis of bioaerosols difficult. Currently, some bioaerosol sampling methods require impact, Collision, filtration and other processes have poor reproducibility, only a ...

AI Technical Summary

Problems solved by technology

However, due to the large single-scattering albedo of bioaerosol clouds in the infrared band, the signal received by the telemetry system not only includes the absorption extinction on the measurement path, but also includes the scattering contribution of sky and ground radiation on the measurement path, which will It directly causes the background baseline fluctuation of the signal received by the telemetry system, and the concentration of bioaerosol clouds is usually low, and its absorption cross section is relatively small

Due to the limitation of measurement conditions, it is impossible to realize the simultaneous measurement of infrared extinction and particle size parameters of bioaerosols under field conditions, and it is difficult to fully obtain the optical characteristics of aerosols. Application of Infrared Spectroscopy in Remote Measurement of Bioaerosols

Images