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Proceedings Paper

Decoupled temperature and strain measurements using fiber Bragg grating sensors
Author(s): Eric J. Ruggiero; Hua Xia; Binayak Roy; Yu Zhao
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Paper Abstract

Temperature and strain sensing of critical aircraft engine components is a critical health and prognostics tool for future engine programs. Real-time feedback of key temperature and strain measurements can be used to provide better estimates to ground crews of engine component life, thus minimizing engine downtime and maximizing the effectiveness of planned inspections. One method for monitoring distributed stress and temperature throughout an engine is through the use of Fiber Bragg Grating (FBG) sensors. With just a single sensor line, both temperature and strain can be monitored simultaneously and in a distributed fashion. Unfortunately, FBG sensors bonded to a host structure are susceptible to both thermal strains and mechanically-loaded strains simultaneously, and without intelligent sensor design, the two signals are indistinguishable from each other. In the present work, a sensing array design is proposed and demonstrated to provide a means for separating thermal and mechanically-loaded strain signals by using two FBG sensors in close proximity to each other. Experimental results are provided using a structural beam element to demonstrate the feasibility of the proposed approach for decoupling the temperature and strain effect from fiber Bragg grating sensors.

Paper Details

Date Published: 25 August 2008
PDF: 10 pages
Proc. SPIE 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II, 70561Y (25 August 2008); doi: 10.1117/12.793404
Show Author Affiliations
Eric J. Ruggiero, GE Global Research (United States)
Hua Xia, GE Global Research (United States)
Binayak Roy, GE Global Research (United States)
Yu Zhao, GE Global Research (United States)

Published in SPIE Proceedings Vol. 7056:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II
Shizhuo Yin; Ruyan Guo, Editor(s)

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