Selective detection of hydrogen sulphide by single semiconductor sensors under non-stationary flow of gas medium

Abstract

A method of reducing gases selective detection with a single low-selective semiconductor sensor is
developed. The method is based on non-stationary flow of the gas mixture under study. Catalytic activity of
semiconductor sensor leads to an interaction of reducing gases with air oxygen. Without gas flow though the
camera, the composition of the gas mixture inside it significantly changes, what affects the readings of the
sensor. The character of sensor readings changes is defined by qualitative and quantitative composition of
explored medium what allows execute not only quantitative, but also qualitative detection of hydrogen sulfide
at concentrations above 10 ppm using single low-selective sensor.