Lock-in white-light-interferometry-based all-optical photoacoustic spectrometer

被引：98
作者：
Chen, Ke [1 ]
Yu, Zhihao [2 ]
Gong, Zhenfeng [1 ]
Yu, Qingxu [1 ]
机构：
[1] Dalian Univ Technol, Sch Optoelect Engn & Instrumentat Sci, Dalian 116024, Peoples R China
[2] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
来源：
OPTICS LETTERS | 2018年 / 43卷 / 20期
关键词：
HIGH-SENSITIVITY; GAS-DETECTION; ACOUSTIC SENSOR; PRESSURE SENSOR; SPECTROSCOPY; LASER; MICROPHONE; ALGORITHM;
D O I：
10.1364/OL.43.005038
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An all-optical photoacoustic spectroscopy based on lock-in white-light interferometry is proposed for trace gas detection. The cavity length of the fiber-optic Fabry-Perot cantilever microphone is demodulated by a high-speed white-light interferometer, whose spectral sampling is synchronously triggered by a phased locked signal. To improve the signal-to-noise ratio, the demodulated digital photoacoustic signal is further processed by a specially designed virtual lock-in amplifier. The designed photoacoustic spectrometer has been tested for trace acetylene (C2H2) detection in the near-infrared region. The normalized noise equivalent absorption coefficient for C2H2 is achieved to be 1.1 x 10(-9) cm(-1) W Hz(-1/2). (C) 2018 Optical Society of America
引用
收藏
页码：5038 / 5041
页数：4
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