Journal
OPTICS LETTERS
Volume 43, Issue 20, Pages 5038-5041Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.005038
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Funding
- Doctoral Starting Foundation of Liaoning Province [201601040]
- Fundamental Research Funds for the Central Universities [DUT 15RC(3) 112, DUT 18RC (4) 040]
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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
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