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Direct interfacing circuit-based e-nose for gas classification and its uncertainty estimation

This study focuses on the application of a direct interface circuit (DIC) with a microcontroller for the measurement of responses from an array of metal oxide semiconductor (MOS) gas sensors and evaluation of its performance. The authors estimate the uncertainty caused by a sensor circuit and DIC parameters in the measurement of output responses from a MOS gas sensor array. In deriving such a setting, an uncertainty principle is utilised to estimate the ranges of the uncertainty of each parameter causing a deviation in measurement from the true value. The authors explore the extent of uncertainty contributed by both the sensor parameters as well as the DIC parameters of the e-nose system. An experimental investigation demonstrates that the DIC-interfaced MOS gas sensor-based e-nose incorporates various sources of uncertainty.