The Systematization of the Distinction of Mixed Gases Using Semiconductor Gas Sensors

Abstract

As the efficiency of semiconductor gas sensors, like those used in gas warning systems, is not excellent, malfunctions can occur.
To increase efficiency, it is suggested that two types of sensors, both of them having the ability to sense all types of gases, should be used. This may work for both a certain single gas and mixed gases.
However, this will not work for any combination of mixed gases where the patterns are increased.
To improve the ability to simultaniously distinguish the types of mixed gases, we examined various possibilities. By using three different sensors and a personal computer, we were able to compare and calculate each sensor's voltage output. We used the change in the sensor pattern caused by altering the voltage of the sensor heater. As the result of our findings, we report that the systemized distinction of both a single and two types of mixed gases is possible.