An ultrasonic gas relative humidity detection method and device using sound velocity changes

Abstract

The invention discloses a method and a device for detecting the ultrasound gas relative humidity through utilizing sound speed variations. According to the detection method, the relative humidity factor of the current monitoring environment is obtained through measuring the propagation speeds of the sound wave under 100% humidity, 0% humidity and current humidity condition. The detection device comprises a control display module and a measuring cavity, wherein the control display module comprises a DSP (digital signal processor) control module, a display module and a power supply module; the DSP control module is used for generating a fixed-frequency ultrasonic wave signal so as to be transmitted by an ultrasonic transmitter, and controlling the movement of a supersonic receiver so as to carry out operation treatment; a nixie tube display module is mainly used for displaying the result operated by the DSP control module on the display module; and the power supply module is in charge for electric power supply of the whole device. The method and device provided by the invention have the advantages that the measuring environmental requirement is low, the instrument price is low, the measurement is convenient and rapid, the measurement result is exact and reliable, and the like; and the method and the device have important practical application value.

Description

technical field [0001] The invention relates to the technical field of ultrasonic propagation velocity measurement, in particular to a method and device for detecting the relative humidity of gas by measuring the ultrasonic propagation velocity. Background technique [0002] Gas humidity reflects the moisture content in the gas, which is an important parameter index in environmental monitoring. [0003] Industrial and agricultural production, meteorology, environmental protection, national defense, scientific research, aerospace and other departments all need to measure and control the humidity of the environment; in daily life, air humidity also has an important impact on human health, and the measurement of humidity can affect the Comfort is measured, so as to improve people's comfort and improve the living environment of human beings. It can be seen that the control of environmental humidity and the detection and analysis of the moisture value of industrial materials hav...

AI Technical Summary

Problems solved by technology

The disadvantage of capacitive sensors is that the output is non-linear, and the influence of parasitic capacitance often reduces the sensitivity of the sensor, resulting in reduced measurement accuracy

Moreover, the current humidity measuring devices must be placed in the gas to be tested for a certain period of time in order to obtain more accurate results.

Images