Research on coal mine gas sensor systems based on near infrared spectrum

Explosion caused by gas is one of the major coal mine accident, and real-time detection of the coal mine gas is becoming more and more important. In this paper we introduce a method based on near infrared spectrum coal mine gas sensor systems aiming at the errors caused by background-interference in detection on the concentration of methane gas in the past. We choose equal-absorption method in the experiment to eliminate the inaccuracy caused by spectrum of other gas absorbed at the same time. Also, we make use of a absorption cell to eliminate inaccuracy caused by different absorption parameters and interference caused by background. The experiment shows that the effect is very good.