Design and Test of Methane Gas Sensor Based on NDIR
Aiming at the problems of low sensitivity and long response time of non-dispersive infrared CH4 gas sensor,a CH4 gas sensor based on photoconductive principle is designed.The sensor is mainly composed of PbSe photoconductive infrared detector,signal processing circuit,light source driving circuit and light path gas chamber.By analyzing the relationship between gas concentration and detector output signal,the concentration output relationship equation is fitted to realize the detection function.Through experiments,gases with different concentrations are detected at room temperature.The results show that the output error,minimum detection limit,minimum response time and other parameters of the sensor are good,and the gas can be effectively measured in the range of 1000 cm3/m3.
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