The Method of the Sensitivity Comparison of the Tin Dioxide Gas Sensor in Periodic Steady State

Libor Gajdosik

The Method of the Sensitivity Comparison of the Tin Dioxide Gas Sensor in Periodic Steady State

Číslo: 3/2017
Periodikum: Advances in Electrical and Electronic Engineering
DOI: 10.15598/aeee.v15i3.2352

Klíčová slova: Semiconductor gas sensor; temperature modulation; thermal cycling; thermal inertia, tin dioxide, Polovodičový snímač plynu; teplotní modulace; Tepelné cyklování; tepelná setrvačnost, oxid cíničitý.

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Anotace: The formulas for the time dependency of the electrical conductivity of the sensor in thermal periodic steady state in the clean air atmosphere were derived herein. The created model of the sensor was experimentally verified and enables to compare the sensitivity to the tested substance at the frequencies at which the tests were carried out. The experiments were carried out with the sensors MQR 1003, SP 11, and TGS813. The sensors were tested in the clean air atmosphere and subsequently in the presence of ethanol, acetone and toluene vapour in the air at three different frequencies.