针对井下甲烷浓度监控干扰大的问题, 结合实时监测甲烷浓度的系统要求, 设计角镜连动的自消震光学结构, 构建了基于无线网络的实时数据通信系统.在干涉系统中, 固定两个角镜位置, 将两片半透半反镜用连杆结构同步旋转, 由此产生光程差.由于采用了连杆结构, 任意时刻引入的震动在两个分束镜上等量存在, 其结果是差分值, 可实现完全相消.由分析分束器的最大旋转范围计算得到系统的光程差变化范围.结合比尔朗伯定律, 给出系统在井下工作的甲烷气体浓度最低检出限.分别在实验室及矿井主巷道中完成实验过程, 通过化学反应法求得被测甲烷气体的标准浓度, 与WQF530型光谱分析仪的测试结果作比较,结果表明：在实验室无干扰条件下, 两种检测方法的相对误差均小于1.0%;在井下实验中, 传统光学检测方法受环境影响明显, 相对误差大幅增加, 而本系统测试结果基本稳定, 具有较强的抗干扰能力及较高的稳定性.

To effectively monitor methane concentration in the underground, for interference large characteristics underground , combined with real-time monitoring for methane concentration requirements, self-eliminate vibration optical structure was designed with rectangular prism linked, and the real-time data communication system was constructed based on the wireless network. In interferometer system, the position of two rectangular prism were fixed. The two beam splitters with connecting rod so that it can rotate synchronously, and the optical path difference is generated by rotation. As a result of the link structure, the vibration introduced into the two beam splitters are present in equal amounts at any time. Because the results was calculated used the difference value, therefore, it can be completely destructive effect. By analyzing the maximum range of rotation of beam splitter, the optical path difference range of the system can be calculated. Then through Beer-Lambert law, methane gas concentration detection limit of the system was given in the underground. Experiment in the laboratory and in the main mine roadway were completed, the measured standard concentration of methane gas obtained through a chemical reaction, and the results was compared to test results of WQF530 type spectrum analyzer. The results show that under the conditions of non-interference in the laboratory, the relative error of two detection methods were less than 1.0%;In the underground experiments, the test results of conventional optical detection methods significantly affected by the environment, and relative error was greatly increased, but the test results of the system was stable. So it is strong anti-interference ability and stability.