High-Sensitivity Multitrace Gas Simultaneous Detection Based on an All-Optical Miniaturized Photoacoustic Sensor
High-Sensitivity Multitrace Gas Simultaneous Detection Based on an All-Optical Miniaturized Photoacoustic Sensor
复制标题
基于全光学小型光声传感器的高灵敏度多痕量气体同时检测。
DOI：
10.1021/acs.analchem.2c02767
复制
发表时间：
2022-09-13
影响因子：
7.4
通讯作者：
Mei, Liang
中科院分区：
文献类型：
--
作者：
Wu, Guojie;Gong, Zhenfeng;Mei, Liang
提出了一种全光小型化多气体同时检测光声传感器，该传感器主要由一个铜管、一个二氧化硅悬臂梁和四根单模光纤组成。用三根单模光纤作为激励光纤传输不同波长的激光，其余一根用作探测光纤。PA池(PAC)和传感器的体积分别为36亩L和71立方毫米。以全光小型化功率放大器传感器为探测器，1532.8、1576.3和1653.7 nm分布反馈激光器为乙炔(C2H2)、硫化氢(H2S)和甲烷(CH4)气体的激发源，以高速光谱仪为解调器，研制了一套多气体同时测量的激光光声光谱(PAS)系统。对C2H2、H2S和CH4的最低检测下限分别为4.8ppb、162ppb和16.6ppb，积分时间为100ppb。该传感器具有在立方毫米尺度空间同时测量多种气体的高灵敏度的潜力。
We propose an all-optical miniaturized multigas simultaneous detection photoacoustic (PA) sensor, which is primarily composed of a copper tube, a silica cantilever, and four single-mode fibers. Three single-mode fibers are used as excitation fibers to transmit lasers of different wavelengths, and the remaining one is used as a probe fiber. The volumes of the PA cell (PAC) and the sensor are 36 mu L and 71 cubic millimeters, respectively. A laser photoacoustic spectroscopy (PAS) system, using the all-optical miniaturized PA sensor as a detector, 1532.8, 1576.3, and 1653.7 nm distributed feedback (DFB) lasers as the excitation sources for acetylene (C2H2), hydrogen sulfide (H2S), and methane (CH4) gases, and a high-speed spectrometer as a demodulator, has been developed for multigas simultaneous measurements. The minimum detection limits of 4.8, 162, and 16.6 parts per billion (ppb) have been achieved for C2H2, H2S, and CH4, respectively, with an integration time of 100 s. The reported sensor shows a potential for high-sensitivity multigas simultaneous measurements in cubic millimeter-scale space.