ABSTRACT
Accurate measurement of methane concentration is very important for the early warning and control of coal mine disasters. Aiming at the problem that the measurement precision and reliability of the existing infrared methane sensor are slightly affected by pressure, this paper analyzed the principle of the infrared methane sensor and the cause of the error. Furthermore, through the experiment of measuring methane concentration under different gas pressure conditions, the pressure compensation calculation model of the infrared methane sensor is obtained by using the least square method. Through the compensation calculation, the measurement error of the infrared methane sensor in the pressure range of 40 - 120kPa can meet the requirement of various kinds of sensors in the coal industry, which provides an effective path for methane gas detection in coal mine.
