Device and method for measuring atmospheric particulate matter based on surface acoustic wave technology

Abstract

The invention discloses an atmospheric particulate measuring device and method based on surface acoustic wave technology. The measuring device comprises an impact type stage sampling unit, a surface acoustic wave sensor, a flow control unit and a control and arithmetic unit, wherein atmospheric particulates of different sizes are separated by the impact type stage sampling unit; the surface acoustic wave sensor is used for collecting the separated particulates of different sizes; the flow control unit is used for obtaining the volume of passing gas; the flow control unit is connected with thatcontrol and arithmetic unit, the control and arithmetic unit controls flow of wind speed according to calculation parameters of the flow control unit, simultaneously collects signals of the surface acoustic wave sensor, calculates mass of the particulates of different sizes, and calculates volume concentration or mass concentration of the atmospheric particulates of different sizes according to mass of the particulates of the size. Integration of particle size cutting and collection of the atmospheric particulates is achieved, mass of the particulates is directly measured by the surface acoustic wave sensor, and detection precision of the mass of the particulates is improved.

Description

technical field [0001] The invention relates to the field of atmospheric particle measurement, in particular to an atmospheric particle measurement device and method based on surface acoustic wave technology. Background technique [0002] The techniques for measuring atmospheric particulates in the prior art include the light scattering method, the β-ray method and the micro-oscillating balance method. [0003] The light scattering method is based on the principle of light scattering. When the light beam is incident on the particle, it will be scattered around the space, and the scattering parameters of the light are closely related to the particle size of the particle, which provides a scale for the measurement of the particle. [0004] The β-ray meter uses the principle of Beta ray attenuation. The ambient air is sucked into the sampling tube by the sampling pump and discharged through the filter membrane. The particles are deposited on the filter membrane. When the β-ray...

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Problems solved by technology

[0006] The measurement accuracy of the light scattering method is low, and the corresponding products of the β-ray method and the micro-oscillating balance method are large in size, expensive and high in maintenance costs, and it is difficult to obtain a large number of promotion and application

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