Quartz-Enhanced Photoacoustic Spectroscopy for Four-Component Gas Detection Based on Two Off-Beam Acoustic Microresonators

Frontiers in Physics

Cheng Wang¹  Xiyu Pang¹  Zongliang Wang² 

[1] Department of Information Engineering, Shandong Jiaotong University, Jinan, China;School of Physics Science and Information Technology and Shandong Key Laboratory of Optical Communication Science and Technology, Liaocheng University, Liaocheng, China;

关键词: photoacoustic spectroscopy;    acoustic microresonators;    quartz tuning fork;    fiber gas sensor;    off-beam;   

DOI  :  10.3389/fphy.2020.594326

来源: DOAJ

【 摘 要 】

A compact and portable quartz-enhanced photoacoustic spectroscopy gas sensor was developed for four-component gas detection using two off-beam acoustic microresonators The two AMRs were placed in parallel on opposing sides of a quartz tuning fork for photoacoustic signal enhancement. Four distributed feedback (DFB) lasers were connected to the four ends of the two off-beam AMRs using a fiber collimator for photoacoustic signal excitation. Four-component gas sensing was achieved via time-division multiplexing of the distributed feedback laser driver currents. The four-component gas sensing scheme was used to detect acetylene (C2H2) at 1,532.83 nm, methane (CH4) at 1,653.722 nm, water vapor (H2O) at 1,368.597 nm and carbon dioxide (CO2) at 1,577.787 nm for feasibility testing. Minimum detection limits of 3.6 ppmv for C2H2, 34.71 ppmv for CH4, 1.09 ppmv for H2O, and 341.18 ppmv for CO2 were obtained, and the linear responses reached 0.9982, 0.9969, 0.99843 and 0.99591 for C2H2, CH4, H2O and CO2, respectively, at 1.5 s intervals.

【 授权许可】

Unknown