Research on fiber-optic cantilever-enhanced photoacoustic spectroscopy for trace gas detection

Ke Chen; Xinlei Zhou; Zhenfeng Gong; Shaochen Yu; Chao Qu; Min Guo; Qingxu Yu

doi:10.1117/12.2282561

12 January 2018 Research on fiber-optic cantilever-enhanced photoacoustic spectroscopy for trace gas detection

Ke Chen, Xinlei Zhou, Zhenfeng Gong, Shaochen Yu, Chao Qu, Min Guo, Qingxu Yu

Proceedings Volume 10621, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 1062108 (2018) https://doi.org/10.1117/12.2282561
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

We demonstrate a new scheme of cantilever-enhanced photoacoustic spectroscopy, combining a sensitivity-improved fiber-optic cantilever acoustic sensor with a tunable high-power fiber laser, for trace gas detection. The Fabry-Perot interferometer based cantilever acoustic sensor has advantages such as high sensitivity, small size, easy to install and immune to electromagnetic. Tunable erbium-doped fiber ring laser with an erbium-doped fiber amplifier is used as the light source for acoustic excitation. In order to improve the sensitivity for photoacoustic signal detection, a first-order longitudinal resonant photoacoustic cell with the resonant frequency of 1624 Hz and a large size cantilever with the first resonant frequency of 1687 Hz are designed. The size of the cantilever is 2.1 mm×1 mm, and the thickness is 10 μm. With the wavelength modulation spectrum and second-harmonic detection methods, trace ammonia (NH₃) has been measured. The gas detection limits (signal-to-noise ratio = 1) near the wavelength of 1522.5 nm is achieved to be 3 ppb.

Citation Download Citation

Ke Chen, Xinlei Zhou, Zhenfeng Gong, Shaochen Yu, Chao Qu, Min Guo, and Qingxu Yu "Research on fiber-optic cantilever-enhanced photoacoustic spectroscopy for trace gas detection", Proc. SPIE 10621, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 1062108 (12 January 2018); https://doi.org/10.1117/12.2282561

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