Automatic Calibration Method for β Absorption Dust Meter

Abstract

The invention discloses an automatic calibration method for a beta absorption-type dust measurement instrument. The method comprises the following steps: aiming at a blank filter membrane, continuously counting the radiation intensity of a beta radiation source passing through a unit area of the blank filter membrane for Q pulses by using a detector, averaging Q / 2 pulses in the Q pulses, making as Na, averaging the remaining Q / 2 pulses, subtracting a difference value C from an average value and making as Nb; judging whether the working precision of the beta absorption-type dust measurement instrument can meet using requirements by taking the mass per unit area delta m of a standard membrane or a mass absorption coefficient standard value k as a working precision acknowledge reference. The beta absorption-type dust measurement instrument can be calibrated automatically without using the standard membrane by the method disclosed by the invention without adding manpower and auxiliary facilities; the calibration result is accurate and reliable; the calibration operation is performed on the beta absorption-type dust measurement instrument without manual timing, so that the time and the labor are saved.

Description

technical field [0001] The invention relates to a calibration method for a β-absorbing dust measuring instrument without using a standard diaphragm, and belongs to the field of equipment calibration. Background technique [0002] At present, the monitoring of fine particulate matter (such as PM2.5) in the air is usually achieved by using a β-absorption dust detector. Its energy is absorbed by the material and attenuates, and the degree of energy attenuation is only related to the quality of the material it passes through (it has nothing to do with the material thickness, density and other characteristics). Such as figure 1 , the β absorption dust detector includes a gas pipeline 11, the top of the gas pipeline 11 is provided with a sampling inlet 12, the sampling outlet of the gas pipeline 11 is connected with an output pipeline 20, and the outlet of the output pipeline 20 is provided with Aspirating pump 16, this air pipeline 11 interior is provided with β radiation sourc...

AI Technical Summary

Problems solved by technology

[0010] It can be seen that in the process of actually using the β-absorbing dust measuring instrument, in order to ensure the working accuracy of the β-absorbing dust measuring instrument, it is a very important task to perform timing calibration for the β-absorbing dust measuring instrument. It is undoubtedly a heavy work for users who have no calibration experience, so generally the manufacturer sends professionals to perform calibration operations for users. However, unattended β absorption dust meters are generally placed in In remote areas, and it takes a lot of time to perform a calibration operation, it can be seen that calibration is a very cumbersome and wasteful work of manpower and material resources

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