Particulate matter concentration detection device based on beta-ray method

Abstract

The invention relates to a particulate matter concentration detection device based on a beta-ray method, which comprises a final assembly plate, a sampling mechanism, a mobile detection mechanism, a paper tape pressing mechanism, a guide wheel and a paper tape sampling point detection mechanism. A paper tape is guided by the guide wheel to keep horizontal. The sampling mechanism is used for pressing the paper tape and extracting air for sampling, and the paper tape sampling point detection mechanism realizes movement detection of sampling points on the paper tape. The mobile detection mechanism is used for realizing position switching between a detection position and a sampling position and comprises a linear module, a mobile seat and a detection element, one side of the mobile seat is fixed on the linear module, and the detection element is arranged on the other side of the mobile seat. According to the scheme, a continuous automatic monitoring scheme in which the paper tape and the sampling mechanism are fixed and the detection mechanism moves is provided through reverse thinking design, the detection accuracy of the particulate matter concentration is remarkably improved in combination with heat insulation design and the additionally-arranged paper tape pressing mechanism, and the device is particularly suitable for an online instrument running for a long time and has a remarkable advantage in improvement of the detection precision.

Description

technical field [0001] The invention relates to the field of particle concentration detection, in particular to a particle concentration detection device based on a β-ray method. Background technique [0002] At present, in the method of monitoring the concentration of atmospheric particulate matter by the β-ray method, there are two detection methods, that is, sampling and detection are at the same station (in situ) and sampling and detection are separated (ex situ). The in-situ detection method has a simple structure and will not affect the detection results due to the positioning error of the tape movement, but the temperature change during sampling will affect the data collection of the photomultiplier tube (β-ray detector), resulting in the measured data not being accurately reflected The real situation of the environment; and the abnormal position detection mostly uses the motor to drive the paper tape to move back and forth between the sampling position and the detect...

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that the existing dislocation detection cannot overcome the influence of the expansion and contraction of the paper tape itself on the detection, the present invention provides a new type of particle concentration detection device based on the β-ray method, and realizes the position between the sampling point and the detection point by moving the detection mechanism. Switching, accurate positioning, easy installation, overcome the adverse effect of tape stretching on detection in a single measurement cycle, and can effectively improve the accuracy of detection data

Images