1 May 1994 Combined fiber optic strain sensor and composite cure monitor for smart structure applications
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Abstract
An adaptation of an extrinsic Fabry-Perot interferometer (EFPI) strain sensor is described that permits the state of cure of an epoxy matrix to be monitored when the sensor is embedded in a polymeric matrix composite. By using a glass rod with a retroreflecting end for the target fiber in the EFPI sensor, the intensity of the light reflected depends on the refractive index of the host matrix, if a low coherence source is used. As the epoxy cross-links during cure, the refractive index of the epoxy will increase to a value exceeding that of the target fiber. The resulting increased loss in the fiber can be detected at the sensor output and correlated to the state of cure of the epoxy. After cure, the sensor may be operated as a conventional EFPI strain sensor if a coherent source is used.
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Russell G. May, Russell G. May, James M. Sanderson, James M. Sanderson, Richard O. Claus, Richard O. Claus, } "Combined fiber optic strain sensor and composite cure monitor for smart structure applications", Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); doi: 10.1117/12.173973; https://doi.org/10.1117/12.173973
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