| 光谱学与光谱分析 |
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| Quartz-Enhanced Photoacoustic Spectroscopy Trace Gas Detection System Based on the Fabry-Perot Demodulation |
| LIN Cheng, ZHU Yong*, WEI Wei, ZHANG Jie, TIAN Li, XU Zu-wen |
| College of Optoelectronic Engineering of Chongqing University, Chongqing 400044, China |
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Abstract An all-optical quartz-enhanced photoacoustic spectroscopy system, based on the F-P demodulation, for trace gas detection in the open environment was proposed. In quartz-enhanced photoacoustic spectroscopy (QEPAS), an optical fiber Fabry-Perot method was used to replace the conventional electronic demodulation method. The photoacoustic signal was obtained by demodulating the variation of the Fabry-Perot cavity between the quartz tuning fork side and the fiber face. An experimental system was setup. The experiment for detection of water vapour in the open environment was carried on. A normalized noise equivalent absorption coefficient of 2.80×10-7 cm-1·W·Hz-1/2 was achieved. The result demonstrated that the sensitivity of the all-optical quartz-enhanced photoacoustic spectroscopy system is about 2.6 times higher than that of the conventional QEPAS system. The all-optical quartz-enhanced photoacoustic spectroscopy system is immune to electromagnetic interference, safe in flammable and explosive gas detection, suitable for high temperature and high humidity environments and realizable for long distance, multi-point and network sensing.
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Received: 2012-09-26
Accepted: 2012-11-22
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Corresponding Authors:
ZHU Yong
E-mail: yongzhu@cqu.edu.cn
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