Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61596
Title: Optical fiber tip-based quartz-enhanced photoacoustic sensor for trace gas detection
Authors: Li, Z
Wang, Z
Wang, C
Ren, W
Issue Date: 2016
Publisher: Springer
Source: Applied physics. B, Lasers and optics, 2016, v. 122, no. 5, 147 How to cite?
Journal: Applied physics. B, Lasers and optics 
Abstract: We reported the development of an evanescent-wave quartz-enhanced photoacoustic sensor (EW-QEPAS) using a single-mode optical fiber tip for sensitive gas detection in the extended near-infrared region. It is a spectroscopic technique based on the combination of quartz-enhanced photoacoustic spectroscopy with fiber-optic evanescent-wave absorption to achieve low optical noise, easy optical alignment, and high compactness. Carbon monoxide (CO) detection at 2.3 μm using a fiber-coupled, continuous-wave, distributed-feedback laser was selected for the sensor demonstration. By tapering the optical fiber down to 2.5 μm diameter using the flame-brushing technique, an evanescent field of ~0.6 mW around the fiber tip was absorbed by CO molecules. Besides an excellent linear response (R2 = 0.9996) to CO concentrations, the EW-QEPAS sensor achieved a normalized noise-equivalent absorption (NNEA) coefficient of 8.6 × 10−8 cm−1W/√Hz for an incident optical power of 1.8 mW and integration time of 1 s. The sensor detection sensitivity can be further improved by enhancing the evanescent-wave power on the fiber tip.
URI: http://hdl.handle.net/10397/61596
ISSN: 0946-2171
EISSN: 1432-0649
DOI: 10.1007/s00340-016-6435-7
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