Helmholtz-resonator quartz-enhanced photoacoustic spectroscopy

被引：16
|
作者：
Luo, Huijian [1 ]
Wang, Chenglong [1 ]
Lin, Haoyang [1 ]
Wu, Qian [1 ]
Yang, Zhifei [1 ]
Zhu, Wenguo [1 ]
Zhong, Yongchun [1 ]
Kan, Ruifeng [2 ]
Yu, Jianhu [1 ]
Zheng, Huadan [1 ]
机构：
[1] Jinan Univ, Key Lab Optoelect Informat & Sensing Technol, Guangdong Higher Educ Inst, Guangzhou 510632, Peoples R China
[2] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China
来源：
OPTICS LETTERS | 2023年 / 48卷 / 07期
基金：
中国国家自然科学基金;
关键词：
GAS-DETECTION;
D O I：
10.1364/OL.481457
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this work, Helmholtz-resonator quartz-enhanced photoa-coustic spectroscopy (HR-QEPAS) was developed for trace gas sensing. A pair of Helmholtz resonators with high-order resonance frequency was designed and coupled with a quartz tuning fork (QTF). Detailed theoretical analysis and experi-mental research were carried out to optimize the HR-QEPAS performance. As a proof-of-concept experiment, the water vapor in the ambient air was detected using a 1.39 mu m near -infrared laser diode. Benefiting from the acoustic filtering of the Helmholtz resonance, the noise level of QEPAS was reduced by >30%, making the QEPAS sensor immune to environmental noise. In addition, the photoacoustic signal amplitude was improved significantly by >1 order of mag-nitude. As a result, the detection signal-to-noise ratio was enhanced by >20 times, compared with a bare QTF.(c) 2023 Optica Publishing Group
引用
收藏
页码：1678 / 1681
页数：4
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