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31 May 1999 Characterization of a fiber Bragg grating (FBG)-based palladium tube hydrogen sensor
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A novel fiber Bragg grating based palladium tube sensor was designed for hydrogen leakage detection in aerospace vehicles. The sensor fabrication method was developed and the sensor response was characterized in terms of total wavelength change, response time and degassing ability. Several factors that influence the sensor performance, including the tube thickness, purging temperature, purging gas, hydrogen concentration, and operation temperature, were studied. The sensor response was improved by reducing the thickness of the palladium tube to around 33 micrometer, optimizing the operation temperature to 95 degrees Celsius, and thoroughly degassing the sensor in nitrogen at 95 degrees Celsius for 4 hours. At these conditions, the total wavelength change was about 0.6 nm, the response time (the time to reach a 0.05 nm wavelength change) was about 2 minutes for the four-hour 4% hydrogen tests.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yiwu Tang, Tony Peng, James S. Sirkis, Brooks A. Childers, Jason P. Moore, and Leland D. Melvin "Characterization of a fiber Bragg grating (FBG)-based palladium tube hydrogen sensor", Proc. SPIE 3670, Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (31 May 1999);

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