Identification of the transient response of the capacitive relative humidity sensor

The results of solving the problem of identifying the transient response for the relative air humidity sensor based on experimental data are presented. It is shown that the capacitive relative humidity sensor is an integrated microprocessor system that performs joint processing of the readings of the absolute humidity sensor and the temperature sensor. A mathematical model of the relative humidity measurement process is proposed, the parameters of which are identified by experimental data. The transient response of the absolute humidity sensing element and the temperature sensor are specified under the assumption that they correspond to first-order aperiodic links. Based on the relationships of thermodynamics, Arden Buck equation, and given transient functions, analytical dependences are obtained to identify the parameters of the transient response of the relative humidity sensor using experimental data. A number of field experiments were carried out, the results of which were processed and analyzed in accordance with the proposed mathematical model. The effect of anomalous sensor readings was found, which consists in the fact that with simultaneous stepwise changes in humidity and temperature, there may be changes in the sensor readings in the direction opposite to the direction of the actual change in relative humidity. It is established that the cause of the anomalous results of measurements of relative humidity is the presence of a large multiple of the difference between the response time constant of the absolute humidity sensor and the response time constant of the temperature sensor. Measures are proposed to prevent anomalous results of relative humidity measurements resulting from mismatch of response time constants for absolute humidity sensor and temperature sensor.

относительная влажность, абсолютная влажность, датчик относительной влажности, датчик абсолютной влажности, датчик температуры, идентификация, постоянная времени, relative humidity, absolute humidity, humidity and temperature sensor, identification, time constant

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