Research and design of multi-component gas sensing detection system based on NDIR

According to the infrared absorption characteristics of gas, a multi-component other analyzer is designed using Lambert-Beer absorption law. The most important SNR influence source of the current high-precision infrared gas absorption sensor has been studied, and the light source drive, infrared gas chamber constant temperature control, signal sampling and weak signal processing circuit design have been optimized. A set of NDIR gas detection device has been designed. After the test of low sulfur gas and carbon dioxide gas, the signal noise fluctuation has been reduced from 140 uV to about 50 uV, and the detection limit has reached 0.01 ppm, the technological innovation of NDIR multi-component gas detection has been realized, and the results of this project have successfully achieved mass production.