Resonant optical transduction for photoacoustic detection

T. Lauwers; A. Glière; S. Basrour

doi:10.1117/12.2544616

2 March 2020 Resonant optical transduction for photoacoustic detection

T. Lauwers, A. Glière, S. Basrour

Proceedings Volume 11287, Photonic Instrumentation Engineering VII; 112870P (2020) https://doi.org/10.1117/12.2544616
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

A highly sensitive optical transduction system suitable for photoacoustic trace gas detection is presented. The system includes a thin deformable hinged cantilever assembled on an optical fiber to form a Fabry-Perot cavity, whose length varies according to the acoustic pressure disturbance. Consequently, the optical power of the reflected light fluctuates at acoustic frequencies around the working point, which is stabilized to prevent from environmental drift of the interference fringes. The resonant mechanical structure proposed in this study shows a spectral response in good agreement with FEM simulation, good linearity and stability, with a noise equivalent pressure of 12 μPa/√Hz.

Conference Presentation

Citation Download Citation

T. Lauwers, A. Glière, and S. Basrour "Resonant optical transduction for photoacoustic detection", Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 112870P (2 March 2020); https://doi.org/10.1117/12.2544616

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