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Proceedings Paper

Fiber-optic photo-acoustic spectroscopy sensor for harsh environment gas detection
Author(s): Juntao Wu; Kung-Li Deng; Renato Guida; Boon K. Lee
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Paper Abstract

Photo-acoustic spectroscopy (PAS) has been successfully applied to detect various gases and chemicals due to its high selectivity and sensitivity. However, the performance of the conventional acoustic sensors prohibits the application of PAS for harsh environment gas species real-time monitoring. By replacing conventional acoustic sensors, such as microphone and piezo-transducers, with a high-temperature Fiber Bragg Grating (FBG) vibration sensor, we developed a fiber-optic PAS sensing system that can be used in high-temperature and high-pressure harsh environments for gas species identification and concentration measurement. A resonant acoustic chamber is designed, and FBG vibration sensor is embedded in the molybdenum membrane. An OPO laser is used for spectrum scanning. Preliminary test on water vapor has been conducted, and the result is analyzed. This sensing technology can be adapted into harsh environments, such as Integrated Gasification Combined Cycle (IGCC) power plant, and provide on-line real-time monitoring of gases species, such as CO, H2O, and O2. Presently, our FBG-based vibration sensor can withstand the high temperature up to 800°C.

Paper Details

Date Published: 17 September 2007
PDF: 7 pages
Proc. SPIE 6698, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications, 66980E (17 September 2007); doi: 10.1117/12.734092
Show Author Affiliations
Juntao Wu, Global Research Ctr., General Electric (United States)
Kung-Li Deng, GE Global Research (United States)
Renato Guida, GE Global Research (United States)
Boon K. Lee, GE Global Research (United States)

Published in SPIE Proceedings Vol. 6698:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications
Ruyan Guo; Shizhuo S. Yin; Francis T.S. Yu, Editor(s)

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