Abstract：According to the disadvantages of current methane sensor in coal mine, the infrared methane concentration detection system based on the principle of infrared spectrum absorption was designed using differential absorption technology. In the system single light beam absorbing cell and single light beam and double wavelengths technology are adopted. Differential amplifier circuit serves as the core of faint signal processing circuit that detects the output signal of methane concentration, and linear formula fits the curve of methane concentration and output voltage, which realizes accurate and full range detection of gas concentration. Experiment shows that measurement error is less than 2%, and the system has very high measurement precision and possesses the basis of industrial applications.
Key words：Infrared absorption spectrum;Differential absorption;Linear formula
罗达峰，杨建华，仲崇贵. 基于红外吸收光谱的瓦斯气体浓度检测技术 [J]. 光谱学与光谱分析, 2011, 31(02): 384-386.
LUO Da-feng, YANG Jian-hua, ZHONG Chong-gui . Detection Technology of Methane Gas Concentration Based on Infrared Absorption Spectrum . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(02): 384-386.
