Method for selective gas sensors based on non-linear gas reactions.

摘要

A method for determining an amount of a gas of interest contained in a measurement gas includes the steps of periodically modulating a specified flux of a measurement gas at a first predetermined frequency, periodically modulating a specified flux of a specified gas that can react non-linearly with the gas of interest at a second predetermined frequency, adding the modulated flux of the specified gas to the modulated flux of the measurement gas, passing the mixture of the two modulated gas fluxes through a reactor (32) where the gas of interest reacts with the specified gas to produce a third gas, exposing a gas sensor (34) that can respond to the third gas present in the gas mixture after the reactor, measuring the sensor output at zero frequency (DC) and at specified frequencies (AC), and determining the original concentration of the gas of interest in the measurement gas from the measured sensor output at zero frequency and at the specified frequencies.