Higher Harmonics Of Fast Fourier Transformation Research Articles

Non-linear dynamic responses of a semiconductor gas sensor — Competition effect on the sensor responses to gaseous mixtures

A novel gas-sensing system based on a dynamic non-linear response is reported for evaluating the competition effect on the sensor responses to gaseous mixtures. A sinusoidal temperature change is applied to a semiconductor gas sensor, and the resulting conductance of the sensor is analyzed. The sensor response changes characteristically depending on the composition of the gaseous mixtures and is analyzed by fast Fourier transformation (FFT). Not only the individual concentrations of the samples but also the competition effect on the sensor responses to the gaseous mixtures are evaluated by the higher harmonics of FFT. The competition effect on the response to two samples is theoretically simulated in relation to the kinetics of gas molecules on the semiconductor surface.

Non-linear dynamic responses of a semiconductor gas sensor: Evaluation of kinetic parameters and competition effect on the sensor response

A novel gas-sensing system based on a dynamic non-linear response is reported. A sinusoidal temperature change is applied to a semiconductor gas sensor, and the resulting conductance of the sensor is analyzed. The sensor response changes characteristically depending on the composition of the gas species and is analyzed by fast Fourier transformation (FFT). Not only the individual concentrations of samples but also the competition effect on the sensor responses to gaseous mixtures are evaluated by the higher harmonics of FFT. The physicochemical parameters on the sensor response are estimated based on information from the non-linear response under the application of temperature modulation. The competition effect on the response to two samples is discussed in relation to the kinetics of gas molecules on the semiconductor surface.