Study of Transient Response of Semiconductor Gas Sensor and Construction of Smell Classification Models

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We have pointed out that we can dascify the kind of gases by using transient response of semiconductor gas sensor in previous works. Surface reactions of several kinds of gas molecule and gas sensor were investigated by molecular orbital calculation using SnO2 duster to make dear the origin of the response. The alcoholic and amine gases were used as flammable gases. The calculated results showed that the adsorption distance of the gas molecule from sensor surface depend on the kind of gas molecule and suggested that the adsorption condition affected the reaction on the sensor surface.Model of transient response of semiconductor gas sensor under modulation heating has been constructed to use as a tool for classification of kind of gases. The model consists of thermal conduction process from heater to the sensor surface, reaction process on the sensor surface, and diffusion process near the sensor surface. The calculated transient sensor responses agreed well with experimental results under the rectangular pulse power supplying to the heater. The transient response will give us a method to classify smells by the semiconductor gas sensor. We can predict the sensor transient response so that the model will be useful to classify kinds of gases and smells by using the transient response of the semiconductor gas sensors