A sensor based on high-sensitivity multi-pass resonant photoacoustic spectroscopy for detection of hydrogen sulfide

被引:8
|
作者
Zhang, Mingke [1 ]
Gao, Guangzhen [1 ]
Jiang, Yuhao [1 ]
Wang, Xuan [1 ]
Long, Fangyu [1 ]
Cai, Tingdong [1 ]
机构
[1] Jiangsu Normal Univ, Coll Phys & Elect Engn, Xuzhou 221116, Peoples R China
来源
基金
中国国家自然科学基金;
关键词
Hydrogen sulfide; Multi -pass absorption; Photoacoustic spectroscopy; Trace gas detection; Tunable diode laser; Wavelength modulation spectroscopy; DIODE; LASER; H2S;
D O I
10.1016/j.optlastec.2022.108884
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A high-sensitive tunable diode laser sensor based on photoacoustic spectroscopy and multi-pass absorption spectroscopy is developed for hydrogen sulfide (H2S) detection using a target absorption line at 6287.005 cm-1. Two spherical concave mirrors are utilized as the reflectors to make the laser beam pass through the photo -acoustic cell for 24 times. The wavelength modulation spectroscopy technique with second harmonic detection (WMS-2f) method is employed to reduce external interference and increase the detection sensitivity. With the enhancement of the effective laser power in the multi-pass PA cell, the photoacoustic 2f signal of the target H2S absorption line has a -8 times improvement compared to the sensor system without multi-pass cell. Based on the results of Allan variance analysis, the minimum detection concentration of the system could reach 0.68 ppm with a 10-s average time and it can be further lowered down to -0.1 ppm when a 1-minute averaging time is used. The linear responsivity of the multi-pass PA spectroscopy sensor is estimated to be -0.00112 mV/ppm by linear fitting for a continuous flow gas measurement results. The excellent performance validates the potential of the sensor for field application.
引用
收藏
页数:8
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