Beta particle three-pole ionization dust sensor

Abstract

The invention relates to a beta particle three-pole ionization dust sensor comprising a shell, a reference cavity and a measuring cavity, wherein the reference cavity and the measuring cavity are arranged in the shell in parallel, the reference cavity is formed by sealing a peripheral wall, an upper end cover and a lower end cover, the measuring cavity is formed by enclosing a peripheral wall, the peripheral walls of the opposite position of the reference cavity and the measuring cavity are fixedly connected to form a public cathode, the peripheral wall of the reference cavity is provided with a reference anode which is insulated with the public cathode, the peripheral wall of the measuring cavity is provided with a measuring anode which is insulated with the public cathode, both ends of the measuring cavity are provided with an air inlet and an air outlet, the public cathode is provided with a beta source support, and beta sources are coated on two end surfaces of the beta source support corresponding to the reference cavity and the measuring cavity respectively. The beta particle three-pole ionization dust sensor solves the problem that a filter film is needed by a beta particleabsorption method to measure dust, can uninterruptedly monitor dust in a long period and greatly reduce maintenance workload; and the sealed reference cavity solves the problems of signal drift and zero-point automatic correction of a beta particle ionization method, has high measuring accuracy and good long-time stability and is suitable for on-line monitoring.

Description

technical field [0001] The invention relates to a sensor for measuring dust concentration, especially a three-pole ionization dust sensor for beta particles. Background technique [0002] At present, electrostatic dust sensors and direct-reading dust detectors are mainly used to measure the dust concentration. The former uses dust particles to collide and rub to generate charged dust particles during movement, and generates a weak current signal on the electrode to measure the dust concentration. Practical application In the process, when the charged particles pass through the sensor electrodes, the positive and negative charges are easy to produce neutralization reaction and lose the charge. In addition, when the uncharged dust particles touch the electrodes, no current will be generated, so this method has great limitations in measuring dust; the latter is Use indirect methods for measurement, commonly used are β-ray absorption method and optical scattering method, among w...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of inaccurate measurement, inability to monitor on-line for a long time and heavy workload of use and maintenance of the existing dust sensor, and provide a dust sensor that uses triple ionization of β particles for measurement

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