Detection of a sample gas in the presence of an interferant gas based on a nonlinear dynamic response

Abstract A sample gas was quantitatively distinguished based on the nonlinear dynamic response of a SnO 2 semiconductor gas sensor, even in the presence of water vapor. A sinusoidal temperature change was applied to the sensor, and the resulting output conductance of the sensor was analyzed by fast Fourier transformation (FFT). The higher harmonics of the FFT characterized the nonlinear properties of the response. We found that the dynamic nonlinear responses under the influence of water vapor consist of individual responses to a sample gas and water vapor and that it is possible to determine the concentrations of both the sample gas and water vapor based on the amplitudes of the higher harmonics of the FFT.

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