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Identification of the Transient Response of a Capacitive Relative Humidity Sensor

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Measurement Techniques Aims and scope

This paper presents the results of identifying the transient response of a relative air humidity sensor. 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 transient responses of the absolute humidity sensing element and the temperature sensor are specified under the assumption that they correspond to first-order aperiodic factors. Based on the relationships of thermodynamics, Arden Buck equation, and given transient functions, analytical dependencies are obtained to identify the parameters of the transient response of the capacitive relative humidity sensor. The results of several field experiments are processed and analyzed in accordance with the proposed mathematical model. The effect of anomalous sensor readings is revealed and consists in the fact that with simultaneous stepwise changes in humidity and temperature, the sensor records a change in relative humidity with the opposite sign. It has been established that the cause of the anomalous results of relative humidity measurements is the presence of a large difference between the response time constant of the absolute humidity sensing element and that of the temperature sensor. Measures are proposed to prevent anomalous results of relative humidity measurements.

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Authors and Affiliations

  1. Volzhsky Polytechnic Institute, Branch of the Volgograd State Technical University, Volzhsky, Volgograd Region, Russia

    V. I. Kaplya & A. A. Silaev

  2. Volzhsky Branch of the National Research University – Moscow Power Engineering Institute, Volzhsky, Volgograd Region, Russia

    E. V. Kaplya

Authors
  1. V. I. Kaplya
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  2. E. V. Kaplya
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  3. A. A. Silaev
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Correspondence to V. I. Kaplya.

Additional information

Translated from Metrologiya, No. 4, pp. 51–68, October–December, 2019.

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Kaplya, V.I., Kaplya, E.V. & Silaev, A.A. Identification of the Transient Response of a Capacitive Relative Humidity Sensor. Meas Tech 62, 1099–1105 (2020). https://doi.org/10.1007/s11018-020-01740-0

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