All-Optical Photoacoustic Multigas Analyzer Using Digital Fiber-Optic Acoustic Detector
All-Optical Photoacoustic Multigas Analyzer Using Digital Fiber-Optic Acoustic Detector
复制标题
使用数字光纤声检测器的全光学光声多种气体分析仪
DOI：
10.1109/tim.2020.2993333
复制
发表时间：
2020-10-01
影响因子：
5.6
通讯作者：
Yu, Qingxu
中科院分区：
文献类型：
--
作者：
Chen, Ke;Zhang, Bo;Yu, Qingxu
提出了一种基于数字光纤声探测器的全光声多气体分析仪，该探测器由基于光谱解调的光纤法布里-珀罗（F-P）压力传感器和数字虚拟锁相放大器组成。采用强度调制红外热源和两个波长调制激光二极管对多组分气体的浓度进行定量。来自三个光源的光束耦合到单个非谐振PA单元。产生的PA压力由光纤F-P压力传感器检测，其由近红外光谱仪解调。研制了一种用于检测一次谐波（1f）和二次谐波（2f）信号的锁相白光干涉仪。平均时间为100 s时，CH 4、C2 H2、C2 H4、C2 H6、CO和CO2的噪声等效检测限分别为37、9、6、17、4和60 ppb。
We present an all-optical photoacoustic (PA) multigas analyzer by using a digital fiber-optic acoustic detector, which consists of a spectrum demodulation based fiber Fabry-Perot (F-P) pressure sensor and a digital virtual lock-in amplifier. The concentration of multigas is quantified by using an intensity-modulated infrared thermal source and two wavelength-modulated laser diodes. Light beams from the three sources are coupled to a single nonresonant PA cell. The generated PA pressure is detected by the fiber F-P pressure sensor, which is demodulated by a near-infrared spectrometer. A lock-in white-light interferometer is developed for detecting first-harmonic (1f ) and second-harmonic (2f ) signals. The noise equivalent detection limits with a 100-s averaging time are 37, 9, 6, 17, 4, and 60 ppb for CH4, C2H2, C2H4, C2H6, CO, and CO2, respectively.