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Proceedings Paper

Fiber optic thermal health monitoring of composites
Author(s): Meng-Chou Wu; William P. Winfree; Jason P. Moore
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Paper Abstract

A recently developed technique is presented for thermographic detection of flaws in composite materials by performing temperature measurements with fiber optic Bragg gratings. Individual optical fibers with multiple Bragg gratings employed as surface temperature sensors were bonded to the surfaces of composites with subsurface defects. The investigated structures included a 10-ply composite specimen with subsurface delaminations of various sizes and depths. Both during and following the application of a thermal heat flux to the surface, the individual Bragg grating sensors measured the temporal and spatial temperature variations. The data obtained from grating sensors were analyzed with thermal modeling techniques of conventional thermography to reveal particular characteristics of the interested areas. Results were compared with the calculations using numerical simulation techniques. Methods and limitations for performing in-situ structural health monitoring are discussed.

Paper Details

Date Published: 7 April 2010
PDF: 9 pages
Proc. SPIE 7648, Smart Sensor Phenomena, Technology, Networks, and Systems 2010, 764808 (7 April 2010); doi: 10.1117/12.847322
Show Author Affiliations
Meng-Chou Wu, NASA Langley Research Ctr. (United States)
William P. Winfree, NASA Langley Research Ctr. (United States)
Jason P. Moore, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 7648:
Smart Sensor Phenomena, Technology, Networks, and Systems 2010
Kara J. Peters; Wolfgang Ecke; Theodore E. Matikas, Editor(s)

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