基于空芯带隙型光子晶体光纤的单端置入式同源甲烷检测仪

为了提高复杂环境中甲烷气体探测的适用性,选择空芯带隙型光子晶体光纤(单端镀全反膜)作为光学气室,实现了置入式同源甲烷浓度的探测。采用可调谐半导体激光吸收光谱(TDLAS)技术,结合长度为0.5 m的空芯带隙型光子晶体光纤,实现了甲烷气体的在线测量,系统的检测下限可达到1.92×10^-5,稳定性波动小于±2.18%。单端全反射设计配合同源探测方式使复杂环境中的甲烷浓度的置入式探测成为可能,为单光源分布式探测提供了研究基础。

Single-End Inserted Homologous Methane Detector Based on Hollow-Core Band Gap Photonic Crystal Fibers

To improve the applicability of methane gas detection in complex environments,a hollow-core band gap photonic crystal fiber is used as the optical chamber,realizing the inserted detection of homologous methane concentration.Tunable diode laser absorption spectroscopy with a 0.5-m hollow-core band gap photonic crystal fiber is used for the online detection of methane gas.The detection limit of the designed detection system is approximately 1.92×10-5 and the long-term stability of detection fluctuation is less than±2.18%.The single-ended total reflection design and homologous detection method make inserted detection possible in complex environments.This work provides the research foundation for distributed detection using a single light source.