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Proceedings Paper

Application of an improved EFPI/FBG sensor system to simultaneous strain/temperature measurement of advanced 3D braided composite materials
Author(s): Yun-Jiang Rao; Shengfang Yuan; Xiang Kai Zeng; Dakai Lian; Yi-Ping Wang; Shanglian Huang; Lin Zhang; Ian Bennion
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Paper Abstract

Simultaneous strain and temperature measurement for advanced 3D braided composite materials using fiber-optic sensor technology is demonstrated, for the first time. These advanced 3D braided composites can virtually eliminate the most serious problem of delamination for conventional composites. A tandem in-fiber Bragg grating (FBG)/extrinsic Fabry-Perot interferometric sensor (EFPI) system with improved accuracy has been used to facilitate simultaneous temperature and strain measurement in this work. The non- symmetric distortion of the optical spectrum of the FBG, due to combination of the FBG and the EFPI, is observed for the first time. Experimental and theoretical studies indicate that this type of distortion can affect the measurement accuracy seriously and it is mainly caused by the modulation of the periodic output of the EFPI. A simple method has been demonstrated to improve the accuracy for detection of the wavelength-shift of the FBG induced by temperature change. A strain accuracy of ~+/- 20(mu) (epsilon) and a temperature accuracy of ~+/- 1 degree(s)C have been achieved, which can meet the requirements for practical applications of 3D braided composites.

Paper Details

Date Published: 30 October 2001
PDF: 9 pages
Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); doi: 10.1117/12.447332
Show Author Affiliations
Yun-Jiang Rao, Chongqing Univ. (China)
Shengfang Yuan, Nanjing Univ. of Aeronautics and Astronautics (China)
Xiang Kai Zeng, Chongqing Univ. (China)
Dakai Lian, Nanjing Univ. of Aeronautics and Astronautics (China)
Yi-Ping Wang, Chongqing Univ. (China)
Shanglian Huang, Chongqing Univ. (China)
Lin Zhang, Aston Univ. (United Kingdom)
Ian Bennion, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 4596:
Advanced Photonic Sensors and Applications II
Anand Krishna Asundi; Wolfgang Osten; Vijay K. Varadan, Editor(s)

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