FLUCTUATION ENHANCED GAS SENSING AT MODULATED TEMPERATURE OF GAS SENSOR

摘要

Taguchi gas sensors are commonly used sensors to measure gas concentration. The detection method utilizes only sensor DC resistance changes for determination of various gases concentration. Unfortunately, such technique leads to false results due to cross-sensitivity of gas sensors at presence of other gases. Such adverse effects can be reduced by applying fluctuation enhanced sensing and temperature modulation of sensor which gather more information about ambient atmosphere than the DC resistance. The measurement setup of voltage fluctuations across the gas sensor as well as the selected measurement results are presented. New indicators of gas detection have been proposed. The indicators utilize fluctuations and DC resistance measurements at two different temperatures of the gas sensor.