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Proceedings Paper

Characterization of elliptical core fibers for sensing strain in composite materials
Author(s): Celene DiFrancia; Richard O. Claus; John W. Hellgeth; T. C. Ward
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Paper Abstract

The scope of this research effort centers upon investigating the performance of few-mode, elliptical core (e-core) fibers as strain sensors in composite structures. Primary concerns for the development of such sensors depends upon the assured survivability of the fiber coating during composite cure and the efficient transfer of matrix stresses to the fiber. In previous work, high temperature polyimide coatings for embedded optical fiber strain sensors were examined in this regard. The objective of our current research effort is to characterize the performance of an e-core fiber for sensing strain within cured test coupons of commercially available composite prepreg materials. In these investigations, single, uncoated e-core fibers were placed into graphite/epoxy prepreg material. Test coupons were then processed via the standard protocols for cure. Embedded e-core/composite specimens were examined under controlled tensile and bend conditions. Changes in optical power output were correlated to the mechanically-induced strain on the sample. Memory effects upon optical power output related to strain sensing, indicative of possible matrix/optical fiber debonding, were also investigated.

Paper Details

Date Published: 1 October 1990
PDF: 5 pages
Proc. SPIE 1307, Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors, (1 October 1990); doi: 10.1117/12.21665
Show Author Affiliations
Celene DiFrancia, Virginia Polytechnic Institute and State Univ. (United States)
Richard O. Claus, Virginia Polytechnic Institute and State Univ. (United States)
John W. Hellgeth, Virginia Polytechnic Institute and State Univ. (United States)
T. C. Ward, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 1307:
Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors
Rudolf Hartmann; M. J. Soileau; Vijay K. Varadan, Editor(s)

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