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Proceedings Paper

Fiber optic thermal detection of composite delaminations
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Paper Abstract

A recently developed technique is presented for thermographic detection of delaminations in composites by performing temperature measurements with fiber optic Bragg gratings. A single optical fiber with multiple Bragg gratings employed as surface temperature sensors was bonded to the surface of a composite with subsurface defects. The investigated structure was a 10-ply composite specimen with prefabricated 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 and found to be consistent with the calculations using numerical simulation techniques. Also discussed are methods including various heating sources and patterns, and their limitations for performing in-situ structural health monitoring.

Paper Details

Date Published: 10 May 2011
PDF: 9 pages
Proc. SPIE 8013, Thermosense: Thermal Infrared Applications XXXIII, 801314 (10 May 2011); doi: 10.1117/12.883037
Show Author Affiliations
Meng-Chou Wu, NASA Langley Research Ctr. (United States)
William P. Winfree, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 8013:
Thermosense: Thermal Infrared Applications XXXIII
Morteza Safai; Jeff R. Brown, Editor(s)

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