In-Service Characterization Of Composite Matrices With An Embedded Fluorescence Optrode Sensor

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Abstract
The properties and durability of polymeric matrix composites are affected by the fabrication process and by the effects of their service environment. A dual-role, fluorescence based fiber-optic sensor was developed to monitor the composite curing process and subsequently to monitor the sorbed water content of the cured composite. An embedded sensor waveguide generates a signal which follows the chemorheological changes during cure of a carbon-epoxy laminate and can be used to control the proc-ess. The embedded sensor signal declines in proportion to the sorbed water content and increases when water is desorbed. The sensor can also monitor the processing variables of a carbon-PEEK thermoplastic composite. The potential of free-volume dependent fluorescence probes to monitor the physical aging of an epoxy resin was demonstrated pointing to the potential for an additional application for the sensor.

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