基于Ring-down光学谐振腔的新型瓦斯传感器

New Gas Sensor Based on Ring-Down Optical Resonant Cavity

提出将光谱吸收型传感技术和Ring-down光学谐振腔理论相结合的设计思路,将吸收光强与气体含量之间的定量关系与Ring-down光学谐振腔理论有机结合起来,设计了基于Ring-down光学谐振腔理论的光学瓦斯(甲烷)气体传感器气体吸收腔,以解决传统瓦斯传感器因为气体的谱宽很窄而难以提高微弱信号检测精度和灵敏度的问题。同时根据Lamber-Beer定律和甲烷气体的吸收谱线合理选择系统光源,将改进的双波长单光路的差分检测方法应用于此课题设计中论证了差分检测理论。将这种光纤气体传感器应用于煤矿瓦斯监测中,为煤矿安全监测提供了一种新思想。

The sensor technology based on spectral absorption and Ring-down optical resonant cavity was integrated together,which was proposed as a design idea.The quantitative relationship between optical intensity and gas density combined with the theory of Ring-down optical resonant cavity to design absorption cavity of gas（CH4）sensor that was based on Ring-down cavity.The absorption cavity was designed to solve the problem that it is difficult for traditional gas sensor to improve the accuracy and sensitivity in detecting weak signal because of narrow spectral width.At the same time,according to the Lamber-Beer law and spectral line of absorption of methane,a kind of system light-source was chosen reasonably.The two wavelength-one path differential detecting method was applied in this design to verify theory of differential detecting.Fiber gas sensor was applied to the coal mine gas monitoring,which will provide a new way for coal mine safety monitoring.