Self-checking method, system and device of particle counter and medium

Abstract

The invention discloses a self-checking method, system and device of a particle counter and a medium, and mainly relates to the field of particle counting. The self-checking system of the particle counter comprises a light source, a photoelectric detector, a processing circuit module, an ADC, a DAC, a processor and a counting module. The ADC is used for converting an analog quantity of the first voltage pulse signal into a digital quantity; the processor is used for judging whether the particle counter is qualified or not according to a noise comparison result of the digital quantity and a preset noise threshold value and a counting comparison result obtained by judging the counting result sent by the counting module. The first voltage pulse signal is obtained when the light source is turned on and no detected particles exist in the particle counter, so that the noise value output when no particle counting is performed is represented, and the self-checking system detects the noise of the particle counter through the first voltage pulse signal; through a circuit for processing the second voltage pulse signal and a counting module of the voltage detection particle counter, self-inspection of the particle counter is realized.

Description

technical field [0001] The present application relates to the field of particle counting, and in particular, to a self-checking method, system, device and medium of a particle counter. Background technique [0002] A particle counter is a special instrument for measuring the particle size and distribution of air particles. During measurement, the particle counter will measure the particle size and number of particles in the particle fluid passing through its measurement cavity. The particle size resolution and particle count are based on the scattered light signal of the particle. The scattered light signal is obtained from the photoelectric The output end of the detector is amplified, converted, noise-reduced, etc. to form a voltage pulse signal corresponding to the scattered light signal, and then input to the comparator for comparison and then enters the counting channel of the corresponding particle size for particle counting, which all depend on the accuracy of the part...

AI Technical Summary

Problems solved by technology

[0003] At present, the particle counter is calibrated by regular calibration. The particle counter is not tested before each use, and it cannot be guaranteed that the particle counter is in a normal state every time it is used.

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