Simultaneous strain and temperature measurement of advanced 3-D braided composite materials using an improved EFPI/FBG system

Y.J. Rao, S.F. Yuan, X.K. Zeng, D.K. Lian, Y. Zhu, Y.P. Wang, S.L. Huang, T.Y. Liu, G.F. Fernando, L. Zhang, I. Bennion

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Abstract

Simultaneous strain and temperature measurement for advanced 3-D braided composite materials using fibre-optic sensor technology is demonstrated, for the first time. These advanced 3-D braided composites can virtually eliminate the most serious problem of delamination for conventional composites. A tandem in-fibre 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 the 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 με and a temperature accuracy of ∼ ±1 °C have been achieved, which can meet the requirements for practical applications of 3-D braided composites. © 2002 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)557-566
Number of pages10
JournalOptics and Lasers in Engineering
Volume38
Issue number6
Early online date5 Feb 2002
DOIs
Publication statusPublished - Dec 2002

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Keywords

  • delamination
  • measurement accuracy
  • strain and temperature measurement

Cite this

Rao, Y. J., Yuan, S. F., Zeng, X. K., Lian, D. K., Zhu, Y., Wang, Y. P., Huang, S. L., Liu, T. Y., Fernando, G. F., Zhang, L., & Bennion, I. (2002). Simultaneous strain and temperature measurement of advanced 3-D braided composite materials using an improved EFPI/FBG system. Optics and Lasers in Engineering, 38(6), 557-566. https://doi.org/10.1016/S0143-8166(02)00014-3