大气与环境光学学报, 2015, 10 (2): 165, 网络出版: 2015-04-14
基于中红外DFB-ICL激光器的硫系恶臭气体传感器
Mid-Infrared DFB-ICLs Based Sensor for Odorous Sulfocompounds Monitoring
激光气体传感器 带间级联激光器 空芯光波导 恶臭物质 含硫有机物 甲硫醇 甲硫醚 二甲基硫醚 laser based gas sensors interband cascade laser hollow silica waveguide odorous compounds sulfocompounds methyl mercaptan dimethyl sulfide dimethyl disulfide
摘要
含硫化合物是主要恶臭物质之一,为了实现污染源中含硫化合物排放的连续监测,研制了中红外激光气体传 感器。该传感器采用中红外分布反馈结构的带间级联激光器(DFB-ICL)为光源,工作波长在3.3 μm附近,以空 芯光波导(芯径1000 μm、长度5 m)做气体池,采用自制多通道数字锁相放大器,同时解调1f和2f 谐波信号,通过1f归一化实现免校准测量。使用不同波长激光器可以检测甲硫醇、甲硫醚、二甲基硫醚、硫化氢等硫系恶臭气体。
Abstract
Sulfocompounds is one of the main odor material. A mid-infrared laser based gas sensor is developed for continuous monitoring of the sulfocompounds in pollution emissions. A mid-infrared distributed feedback interband cascade laser (DFB-ICL) is used as light source, and the working wavelength was about of 3.3 μm. A hollow silica waveguide is used for gas cell, and the core diameter is 1000 μm, the length is 5 m. A home-made multi-channel digital lock-in amplifier is adopted to demodulate the 1f and 2f harmonics simultaneously, and calibration-free measurement has been attained by normalized the 2f harmonics with the 1f harmonics. Different wavelength of lasers can be applied to detect methyl mercaptan, dimethyl sulfide, dimethyl sulfide and hydrogen sulfide.
杜振辉, 张哲远, 甄卫萌, 熊博, 李金义. 基于中红外DFB-ICL激光器的硫系恶臭气体传感器[J]. 大气与环境光学学报, 2015, 10(2): 165. DU Zhenhui, ZHANG Zheyuan, ZHEN Weimeng, XIONG Bo, LI Jinyi. Mid-Infrared DFB-ICLs Based Sensor for Odorous Sulfocompounds Monitoring[J]. Journal of Atmospheric and Environmental Optics, 2015, 10(2): 165.