Application of an improved EFPI/FBG sensor system to simultaneous strain/temperature measurement of advanced 3D braided composite materials

Yun-Jiang Rao; Shengfang Yuan; Xiang Kai Zeng; Dakai Lian; Yi-Ping Wang; Shanglian Huang; Lin Zhang; Ian Bennion

doi:10.1117/12.447332

30 October 2001 Application of an improved EFPI/FBG sensor system to simultaneous strain/temperature measurement of advanced 3D braided composite materials

Yun-Jiang Rao, Shengfang Yuan, Xiang Kai Zeng, Dakai Lian, Yi-Ping Wang, Shanglian Huang, Lin Zhang, Ian Bennion

Author Affiliations +

Proceedings Volume 4596, Advanced Photonic Sensors and Applications II; (2001) https://doi.org/10.1117/12.447332
Event: International Symposium on Photonics and Applications, 2001, Singapore, Singapore

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.

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Yun-Jiang Rao, Shengfang Yuan, Xiang Kai Zeng, Dakai Lian, Yi-Ping Wang, Shanglian Huang, Lin Zhang, and Ian Bennion "Application of an improved EFPI/FBG sensor system to simultaneous strain/temperature measurement of advanced 3D braided composite materials", Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); https://doi.org/10.1117/12.447332

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KEYWORDS

Fiber Bragg gratings

Composites

Temperature metrology

Distortion

3D metrology

Sensors

Reflectivity

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