Simulation of Output Response to Mixed Gases by Output Response to Single Gas

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  • NAKAJIMA Takashi
    Department of Industrial Technology, Junior College of Nihon University

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  • 単一ガス出力応答による混合ガス出力応答のシミュレーション
  • タンイツ ガス シュツリョク オウトウ ニ ヨル コンゴウ ガス シュツリョク オウトウ ノ シミュレーション

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Abstract

The gas detection mechanism of a semiconductor gas sensor uses the phenomenon in which the flammable gas is adsorbed on the surface of the sensor when a sintered compact of metallic oxide is heated at a constant temperature with an electric heater in the sensor. If the sensor is set to be activated at a certain temperature, flammable gas such as hydrogen, methane and propane can be detected. A gas leak alarm device uses this phenomenon. Ethanol, however, tends to adsorb more onto the surface of the sensor than other types of flammable gas, and this is a cause of gas sensor malfunction. It is also difficult to distinguish gas types because there is not enough data. <br>We have reported that we could distinguish propane, methane and ethanol by using multiple semiconductor gas sensors to improve the capability of distinguishing gas types, by comparing the output response patterns using a heater voltage control and by investigating the output voltage ratio. <br>In estimating the output response to mixed gases, many patterns were possible as determined by the concentration of each gas. However, when the heater voltage is changed, it is not possible to obtain an output response to mixed gases by merely calculating and synthesizing single gas output responses. This paper describes a simulation of the output response to mixed gases from the output responses to single gas and infers an output response to mixed gases.

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