A Type of Dust-measuring Instrument

摘要

This paper introduced the hardware components of a dust-measuring instrument which can measure dust concentration by using frequency difference of piezoelectric crystal between the cases when there is dust and there is not on it, and the flow chart was givne. The key component is a single chip computer_8031. Dust concentration can be computerized by measuring the resonance frequency of silica Crystal, gas flow and gas temperature. Some components or factors, such as heater, gas=drawing electric motor, hihg voltage and so on, can be controlled to satisfy the measuring conditions and reach the measuring precision.