Gas detection with evanescent-wave quartz-enhanced photoacoustic spectroscopy

Yingchun Cao; Wei Jin; Hoi Lut Ho

doi:10.1117/12.915786

30 January 2012 Gas detection with evanescent-wave quartz-enhanced photoacoustic spectroscopy

Yingchun Cao, Wei Jin, Hoi Lut Ho

Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 835121 (2012) https://doi.org/10.1117/12.915786
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

Abstract

Evanescent-wave gas sensing with tapered optical fibers (TOFs) and quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported. The evanescent field of TOFs with diameter down to sub-wavelength is utilized for photoacoustic excitation in photoacoustic spectroscopy. A quartz tuning fork (QTF) with resonant frequency about ~32.75 kHz is used to detect the generated pressure wave. A normalized noise equivalent absorption coefficient of 1.5×10^-6 cm^-1 W/√Hz is achieved for acetylene detection with a fiber taper with a waist diameter of 1.1 μm. It is found that QEPAS with TOFs of sub-wavelength diameters exhibit comparable sensitivities with open path QEPAS but with additional advantages of lower insertion loss, easier alignment, and multiplexing capability.

Citation Download Citation

Yingchun Cao, Wei Jin, and Hoi Lut Ho "Gas detection with evanescent-wave quartz-enhanced photoacoustic spectroscopy", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 835121 (30 January 2012); https://doi.org/10.1117/12.915786

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