Composite Cure Monitoring With Infrared Transmitting Optical Fibers

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Abstract
The development of infrared-transmitting optical fibers as sensors for monitoring the cure of advanced composite materials is reported. Fourier transform infrared (FfIR) spectra are presented which were remotely sensed during the cure of a graphite/ polyimide matrix prepreg using a 0.2 mm OD x 3m chalcogenide optical fiber and a graphite/epoxy matrix prepreg using ~0.1 mm OD x 2m fluoride optical fiber. This marked the first time infrared-transmitting optical fibers have been used to sense and transmit infrared spectra of polymeric materials. A discussion of the fiber and sensor element, absorption mechanism and potential applications is presented.

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