Lock-in white-light-interferometry-based all-optical photoacoustic spectrometer
Lock-in white-light-interferometry-based all-optical photoacoustic spectrometer
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DOI：
10.1364/ol.43.005038
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发表时间：
2018-10-15
期刊：
影响因子：
3.6
通讯作者：
Yu, Qingxu
中科院分区：
文献类型：
--
作者：
Chen, Ke;Yu, Zhihao;Yu, Qingxu
提出了一种基于锁定白光干涉的全光声光谱技术用于痕量气体检测。光纤法布里-珀罗悬臂梁式传声器的腔长由高速白光干涉仪解调，其光谱采样由锁相信号同步触发。为了提高信号的信噪比，解调后的数字光声信号由一个专门设计的虚拟锁定放大器进一步处理。所设计的光声光谱仪已被用于检测痕量乙炔（C2 H2）在近红外区。C_2H_2的归一化噪声等效吸收系数为1.1 × 10 ~（-9）cm ~（-1）W Hz ~（-1/2）。(C)2018美国光学学会
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