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中文摘要：
根据甲烷分子的光谱吸收特性，研究设计了一套基于差分吸收技术的光纤传感系统。系统以发光二极管（LED）为光源，折返式吸收池作为气室，利用光纤光栅的窄带滤波特性，用双光路实现了差分吸收检测。分析和实验表明，该系统具有可行性，可用于煤矿、天然气站等领域进行远距离气体含量的实时监测。
英文摘要：
According to CH4 absorption spectrum, an optical fiber CH4 sensor system based on the differential absorption technique is researched and designed. The system selects LED as light source and reentrant absorption cell as gas cell. It makes use of the narrow band filtering character of optical fiber grating to implement differential absorption measuring with double beam path. Experiments and analyses indicate that the system is feasible, which can be used for long distance and real-time monitoring in coal mine, natural gas mine and other fields.
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