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中文摘要：
针对矿井瓦斯检测中存在的问题,采用单芯光纤耦合的反射式光束偏转法检测技术,结合Ag/SnO2金属复合薄膜与瓦斯气体接触后发生气敏化学反应,将引起SnO2薄膜的折射率发生变化和等离子表面波共振角移动的性质,提出了一种新的瓦斯检测方法。该方法利用白光光源在覆有选择性气体吸附复合薄膜的表面激发表面等离子波,用单芯光纤耦合的反射式光束偏转法对所激发表面等离子波信息进行采集,并准确检测出环境中甲烷气体的体积分数;用最小二乘法对数据进行拟合,提高了检测精度。由仿真曲线证明,本瓦斯检测方法为瓦斯监测方法提供了一种新途径。
英文摘要：
When the Ag/SnO2 composite metal film is brought into contact with the gas,the gas sensitive chemical reaction will be generated,which results in the refraction index change of SnO2 film and the resonance angle movement of the surface plasma wave.Based on this principle,a novel detection technique for mine gas has been proposed in this paper by using the single fiber coupled reflective beam deflection detection technique.The surface plasma wave was stimulated by using the white light resource on the surface coated with the selective gas adsorption film.The information collection of surface plasma wave was carried out by using the single fiber coupled reflective beam deflection method.Then the volume fraction of methane in the environment can be accurately detected.Finally,a new way for gas monitoring was developed by using the least square method to fit the data and improved the detection accuracy.The simulation curves showed that the method provided a new way to detect mine gas.
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