Fiber optic sensors for composite cure analysis and lifetime           nondestructive evaluation

Jeffrey D. Muhs; Michael R. Cates; Kenneth W. Tobin Jr.; G. J. Capps; David L. Beshears

doi:10.1117/12.35048

1 October 1990 Fiber optic sensors for composite cure analysis and lifetime nondestructive evaluation

Jeffrey D. Muhs, Michael R. Cates, Kenneth W. Tobin Jr., G. J. Capps, David L. Beshears

Proceedings Volume 1375, ICALEO '89: Optical Sensing and Measurement; (1990) https://doi.org/10.1117/12.35048
Event: ICALEO89, 1989, Orlando, FL, United States

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.

Citation Download Citation

Jeffrey D. Muhs, Michael R. Cates, Kenneth W. Tobin Jr., G. J. Capps, and David L. Beshears "Fiber optic sensors for composite cure analysis and lifetime nondestructive evaluation", Proc. SPIE 1375, ICALEO '89: Optical Sensing and Measurement, (1 October 1990); https://doi.org/10.1117/12.35048

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