Design of CO Concentration Detector Based on Infrared Absorption Method

Abstract

Carbon monoxide is a kind of poisonous, flammable and explosive gas, which has great harm to people's life and property. Detection of carbon monoxide concentration is an effective measure to prevent fire. Therefore, the design of an accurate, reliable and timely warning of carbon monoxide detector can largely avoid the occurrence of accidents. In view of the problems caused by CO, we design and realize a CO concentration detection system based on infrared absorption method. By detecting the concentration of CO, we can better judge the harm degree of CO, and do a good job of prevention as soon as possible. Firstly, this paper introduces the principle of infrared absorption measurement of CO. Then, according to the characteristics of CO, the system hardware circuit and software program are designed. Finally, the linear fitting of the CO concentration and the reference intensity of the CO gas to the measured intensity ratio is carried out by means of experimental data. The experimental results show that the CO concentration values are in good linear relationship with the values of the intensity ratio, indicating that the calibration method is feasible. The design has the advantages of low cost, small size and low power consumption, and has good application value.