实验研究了近红外可调谐激光二极管吸收光谱技术（TDLAS）在气体监测中的应用，提出了在一种应用于煤矿瓦斯监测的光纤传感方法。该方法基于气体近红外波段的特征吸收，通过对窄线宽分布式反馈（DFB）激光器进行波长调制，并采用谐波检测技术，消除了光源波动和光纤抖动造成的影响，提高了瓦斯气体的测量灵敏度。同时，采用空分复用（SDM）技术组成光纤传感网络，提出了一种能实现在线监测的多点瓦斯传感系统，该方法降低了系统成本，能适应煤矿等恶劣环境的应用需求。

The application of near-infrared tunable diode laser spectroscopy(TDLAS) was investigated experimentally on gas detection, and the application on methane detection in coal mines with fiber sensor was presented. Based on gas absorption characteristics in near-infrared optical bands, with wavelength modulation on narrow-linewidth distributed feed back(DFB) laser, using harmonic detection technology, eliminating the effect of light source fluctuation and fiber jitter, the performance of measurement sensitivity is improved. By using the space division multiplexing(SDM) technology, a multi-point optical fiber sensor system for measuring methane is proposed. This method can reduce system costs, and will be adapted for requirement in harsh environments such as coal mines and so on.