Single light source bio-aerosol particle detecting apparatus

Abstract

The invention relates to a single light source bio-aerosol particle detecting apparatus. The apparatus comprises an ultraviolet light source, an ultraviolet optical path unit, scattered light detecting unit, a fluorescence detecting unit, and a digital processing unit. The ultraviolet optical path unit comprises a truing lens set, a reflector and an ellipsoid mirror. Ultraviolet lights emitted from the ultraviolet light source are trued and collimated by the truing lens set, and enter a central detecting zone of the ellipsoid mirror. Scattered lights and excitation fluorescence are collected by the ellipsoid mirror. An ellipse light spot which passes through the central detecting zone of the ellipsoid mirror is reflected by the reflector, such that double light spots are formed. Scatteredlight signals are detected by the scattered light detecting unit, and the scattered light signals are amplified and output to the digital processing unit. Fluorescence signals are detected by the fluorescence detecting unit, and the fluorescence signals are amplified and output to the digital processing unit. Detection signals from the scattered light detecting unit and the fluorescence detectingunit are received and processed by the digital processing unit, such that detection results are obtained. According to the invention, cost on apparatus design is almost not increased, and detection sensitivity of the apparatus is greatly improved.

Description

technical field [0001] The invention relates to a bioaerosol particle detection device, in particular to a single light source bioaerosol particle detection device capable of synchronously detecting the size of the bioaerosol particle and the bioluminescence characteristics. Background technique [0002] The bioaerosol particle detection device is a detection device for detecting the characteristics of aerosol particles in the atmospheric environment. It is designed based on the principle of light scattering and fluorescence phenomena generated by aerosol particles in the laser beam. When the particles pass through the photosensitive area with the sampling airflow, scattered light pulses related to the particle size and fluorescent pulses related to the particle’s fluorescence characteristics are generated. For the corresponding electrical pulse signal, the signal processing system filters and amplifies the electrical pulse signal, and after screening and counting processing...

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a single light source bioaerosol particle detection device, which is to install a light reflector on the extinction part of the aerosol particle laser analyzer (see patent documents, patent publication number: CN101398367A) The method forms a double spot, and the detection particle calculates the aerodynamic diameter of the particle through the flight time of the double spot, which overcomes the problem that the particle size of the scattered light intensity detection method cannot accurately reflect the particle dynamic particle size parameter

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