Aerosol particle double channel laser detector and detecting method thereof

Abstract

The invention discloses a dual-channel laser detector of aerosol particles and a detection method. The detector is composed of a particles sample injection part and an optical sampling part which are connected, and a controlling and processing part composed of a power supply module (63), a gas control module (64), a detection module (65), a simulating module (66), a data module (67), an industrial control computer module (61) and a display (62) which is respectively electrically connected with a gas pressure sensor (17, 18), an airflow pump (07, 15), a laser (20), an ultraviolet laser (31), an avalanche diode (41) and a photoelectricity multiplication tube (50, 51). The method is that setting the working pressure ratio of the airflow pump, and according to the time difference and intensity of the signals twice output by the avalanche diode, acquiring the particle sizes of the aerosol particles, the distribution information of the particle spectrum and the information of biological active substance and riboflavin to generate corresponding images, then storing and transporting to the display to display. The invention can be used for real-time on-line detection of the aerosol particles in atmosphere.

Description

technical field [0001] The invention relates to a laser detector and a measuring method, in particular to an aerosol particle dual-channel laser detector and a detecting method thereof. Background technique [0002] Atmospheric aerosols are solid particles or liquid droplets suspended in the air. The size distribution, concentration and composition of aerosol particles in the atmospheric environment have a great impact on human living environment and their own health. In atmospheric aerosols, bioaerosols composed of biological substances such as bacteria, bacterial spores, viruses and pollen, etc., account for a small proportion of atmospheric aerosols, but they have a huge impact on human health and the growth of animals and plants. of. As we all know, microorganisms are the source of infection and infectious diseases, and the important way of their transmission is through the atmosphere, such as human tuberculosis and influenza, some diseases of livestock (such as coccid...

AI Technical Summary

Problems solved by technology

However, there are deficiencies in this detection method and device. At first, the particle size of the aerosol particle is determined by measuring the time elapsed when it flies past two laser beams that are close to each other. The flow rate of the measured airflow containing aerosol particles of the measured light source changes with the change of the external air pressure, which limits the accuracy of the measurement and cannot guarantee the stability of the particle spectrum; secondly, only the air pressure can be obtained. The size of th

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