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Dynamic characteristics of the relative humidity sensor


Dynamic characteristics of the relative humidity sensor

Kaplya V.I., Savinov P.N, Beev R.S., Kozina A.V.

Incoming article date: 27.04.2019

The article considers the solution of the problem of determining the dynamic characteristics of the relative humidity sensor, the mathematical model of which was based on the first order aperiodic link. The solution algorithm consists in minimizing the value of the standard mismatch of the approximating function and the set of experimental data. The results of processing experiments with the DHT-22 temperature and humidity sensor are presented. The sensor was placed three times in a medium with high humidity, which allowed to obtain an average experimental transient response. The period of measurement and registration of humidity and temperature was 1.5 seconds. The proposed method of calculating the dynamic parameters of the sensor allowed to determine the value of the time constant and the gain of the aperiodic link for the sensor under study. The obtained dynamic characteristics can be used to form an inverse transfer function for the humidity sensor.

Keywords: capacitive humidity sensor transient response, the sequence of measurements, the time constant, the minimization of the error