SELF-OSCILLATING PARAMETRIC HUMIDITY SENSOR WITH FREQUENCY OUTPUT SIGNAL

Iaroslav Osadchuk


Vinnytsia National Technical University (Ukraine)
http://orcid.org/0000-0002-5472-0797

Alexander Osadchuk

osadchuk.av69@gmail.com
Vinnytsia National Technical University (Ukraine)
http://orcid.org/0000-0001-6662-9141

Vladimir Osadchuk


Vinnytsia National Technical University (Ukraine)
http://orcid.org/0000-0002-3142-3642

Lyudmila Krylik


Vinnytsia National Technical University (Ukraine)
http://orcid.org/0000-0001-6642-754X

Abstract

A self-oscillating parametric humidity sensor has been developed that implements the principle of "humidity-frequency" conversion into hybrid integrated circuit based on a microelectronic transistor structure with a negative differential resistance, in which the humidity-sensitive element is a resistor of the HR202 type. For the purposes of determining parameters self-oscillating parametric humidity sensor with frequency output a mathematical model has been developed that takes into account the effect of humidity on a sensitive resistive element, which is an integral element of the device. Based on the mathematical model, analytical expressions for the transformation function and the sensitivity equation are obtained. It is shown that the main contribution to the conversion function is made by relative humidity. The computer simulation and experimental studies of a self-oscillating parametric humidity sensor with a frequency output signal contributed to obtaining the main parameters and characteristics, such as the dependence of the generation frequency on changes in relative humidity in the range from 30% to 99%, the change in sensitivity on relative humidity, the dependence of the active and reactive components of the impedance in the frequency range from 50 kHz to 2 GHz; standing wave ratio, change in logarithmic magnitude and spectra of the output signal of a parametric humidity sensor with a frequency output signal in the LTE-800 Downlink frequency range. The obtained electrical characteristics confirm the operability of the developed device. The sensitivity of the developed self-oscillating parametric humidity sensor in the range of relative humidity change from 30% to 99% has a value from 332.8 kHz/% to 130.2 kHz/%.


Keywords:

self-oscillating parametric humidity sensor with frequency output, negative differential resistance, humidity-sensitive resistor

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Published
2023-03-31

Cited by

Osadchuk, I., Osadchuk, A., Osadchuk, V., & Krylik, L. (2023). SELF-OSCILLATING PARAMETRIC HUMIDITY SENSOR WITH FREQUENCY OUTPUT SIGNAL. Informatyka, Automatyka, Pomiary W Gospodarce I Ochronie Środowiska, 13(1), 42–49. https://doi.org/10.35784/iapgos.3476

Authors

Iaroslav Osadchuk 

Vinnytsia National Technical University Ukraine
http://orcid.org/0000-0002-5472-0797

Authors

Alexander Osadchuk 
osadchuk.av69@gmail.com
Vinnytsia National Technical University Ukraine
http://orcid.org/0000-0001-6662-9141

Authors

Vladimir Osadchuk 

Vinnytsia National Technical University Ukraine
http://orcid.org/0000-0002-3142-3642

Authors

Lyudmila Krylik 

Vinnytsia National Technical University Ukraine
http://orcid.org/0000-0001-6642-754X

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