Humidity detection device based on integral operation

Abstract

The invention provides a humidity detection device based on integral operation. The device comprises at least two humidity sensitive resistance units, a channel selector connected with the at least two humidity sensitive resistance units to output a detection voltage signal of one of the at least two humidity sensitive resistance units, a signal amplifier, an integral module, a comparison module,and a master control module, wherein an input end of the signal amplifier is connected with an output end of the channel selector; the signal amplifier is used for amplifying the detection voltage signal output by the channel selector to form an amplified signal; the integral module is connected with an output end of the signal amplifier to acquire the amplified signal output by the signal amplifier and perform integral operation on the amplified signal; the comparison module is connected with the integral module to compare integral voltage output by the integral module after the integral operation and preset voltage and output a comparison result signal according to a comparison result; and the master control module is connected with the comparison module and used for calculating a humidity value detected by the corresponding humidity sensitive resistance unit according to the comparison result signal output by the comparison module.

Description

technical field [0001] The invention relates to the field of humidity detection, in particular to a humidity detection device based on integral calculation. Background technique [0002] Humidity detection requires the use of humidity-sensitive components. There are two main types of humidity sensors: resistive and capacitive. The characteristic of the humidity sensitive resistor is that the substrate is covered with a film made of moisture-sensitive material. When the water vapor in the air is adsorbed on the moisture-sensitive film, the resistivity and resistance value of the element will change. Using this characteristic Humidity can be measured. Humidity-sensitive capacitors are generally made of polymer film capacitors. Commonly used polymer materials include polystyrene, polyimide, and cellulose acetate. When the ambient humidity changes, the dielectric constant of the humidity-sensitive capacitor changes, so that the capacitance also changes, and the capacitance ch...

AI Technical Summary

Problems solved by technology

[0003] However, the moisture sensitive resistor used in the humidity detection in the prior art will encounter the defects of low detection accuracy and low sensitivity.

Images