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Proceedings Paper

Fiber optic sensors for composite cure analysis and lifetime nondestructive evaluation
Author(s): Jeffrey D. Muhs; Michael R. Cates; Kenneth W. Tobin; G. J. Capps; David L. Beshears
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Paper Abstract

A proposed multiplexed fiber-optic sensor system capable of analyzing a composite material during its curing cycle and over its service lifetime is presented. The sensor is composed of two independent sensing schemes that will ultimately be multiplexed onto a specialized singlemode/multimode optical fiber. The first sensing scheme is a fiber-optic viscosity and temperature sensor used for composite cure analyses. This sensor is based on (1) the laser-induced viscositydependent fluorescence phenomena observed in epoxy-based composite materials and (2) the temperature-dependent decay-time fluorescence phenomena observed in thermographic phosphors. The second sensor is based on a low-finesse, single-mode fiber-optic Fabry-Perot interferometer and is used as a strain/vibration sensor for lifetime nondestructive evaluations on composites. Exp erimental results have determined that these sensor concepts are feasible alternatives to cureanalysis monitors and conventional strain-analysis techniques.

Paper Details

Date Published: 1 October 1990
PDF: 10 pages
Proc. SPIE 1375, ICALEO '89: Optical Sensing and Measurement, (1 October 1990); doi: 10.1117/12.35048
Show Author Affiliations
Jeffrey D. Muhs, Oak Ridge National Lab. (United States)
Michael R. Cates, Oak Ridge National Lab. (United States)
Kenneth W. Tobin, Oak Ridge National Lab. (United States)
G. J. Capps, Oak Ridge National Lab. (United States)
David L. Beshears, Oak Ridge National Lab. (United States)

Published in SPIE Proceedings Vol. 1375:
ICALEO '89: Optical Sensing and Measurement
Kevin G. Harding, Editor(s)

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