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FIBER OPTIC POLYMER CURE SENSOR

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Abstract

Composite materials consisting of kevlar, graphite, or other fibers embedded in an epoxy or polyimide matrix are finding increasing use in a variety of applications. These materials require a precision cuing process at elevated temperature and pressure. The ultimate mechanical properties of these composites depend on the degree of cure. During the fabrication of a large structure, the degree of cure may vary from place to place due to the inhomogeneity of the starting materials, the exothermic nature of the reaction, the thermal diffusivity of the material, the thermal characteristics of the autoclave and the geometry of the part. Precision curing requires in-situ process control. Several sensing modalities have been proposed for monitoring the cure process, including measurement of the dielectric [1], fluorescent [2, 3], and acoustic [4-6] properties of the curing composition. All these methods require extensive calibration for different materials and cure temperatures, and are not readily adaptable to in-situ monitoring of the final product.

© 1988 Optical Society of America

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