光学学报, 2018, 38 (3): 0328015, 网络出版: 2018-03-20
基于光纤声波传感的超高灵敏度光声光谱微量气体检测 下载: 1230次
Ultra-High Sensitive Photoacoustic Spectrometer for Trace Gas Detection Based on Fiber-Optic Acoustic Sensors
传感器 光纤声波传感 光声光谱 波长调制 微量气体检测 sensors fiber-optic acoustic sensor photoacoustic spectroscopy wavelength modulation trace gas detection
摘要
结合光纤声波传感技术、纵向共振式光声探测技术、波长调制技术和二次谐波检测技术, 提出了一种基于光纤法布里-珀罗干涉传感器的悬臂梁增强型光声信号检测方法。针对光纤耦合近红外激发光的特点, 对共振式光声池进行了优化设计, 搭建了一套超高灵敏度的激光光声光谱微量乙炔气体检测系统。实验结果表明, 当测量时间为60 s时, 该系统对乙炔气体的检测极限达到8×10-10。
Abstract
A cantilever-enhanced photoacoustic signal detection method based on fiber-optic Fabry-Perot interferometric sensors is proposed, which combines the technologies of fiber-optic sensing, longitudinal resonant photoacoustic spectroscopy, wavelength modulation and second-harmonic detection. According to the characteristics of fiber coupling near-infrared exciting light, the resonant photoacoustic cell is optimally designed. A high-sensitivity laser photoacoustic spectrometer for trace acetylene gas detection is developed. Experimental results show that the detection limit of acetylene reaches 8×10-10 with the measurement time of 60 s.
陈珂, 袁帅, 宫振峰, 于清旭. 基于光纤声波传感的超高灵敏度光声光谱微量气体检测[J]. 光学学报, 2018, 38(3): 0328015. Chen Ke, Yuan Shuai, Gong Zhenfeng, Yu Qingxu. Ultra-High Sensitive Photoacoustic Spectrometer for Trace Gas Detection Based on Fiber-Optic Acoustic Sensors[J]. Acta Optica Sinica, 2018, 38(3): 0328015.