Fiber optic thermal health monitoring of composites

Meng-Chou Wu; William P. Winfree; Jason P. Moore

doi:10.1117/12.847322

7 April 2010 Fiber optic thermal health monitoring of composites

Meng-Chou Wu, William P. Winfree, Jason P. Moore

Proceedings Volume 7648, Smart Sensor Phenomena, Technology, Networks, and Systems 2010; 764808 (2010) https://doi.org/10.1117/12.847322
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

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.

Citation Download Citation

Meng-Chou Wu, William P. Winfree, and Jason P. Moore "Fiber optic thermal health monitoring of composites", Proc. SPIE 7648, Smart Sensor Phenomena, Technology, Networks, and Systems 2010, 764808 (7 April 2010); https://doi.org/10.1117/12.847322

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