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Cure
and Aging Monitoring of Epoxies by Fluorescence Spectroscopy
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Demonstrated intrinsic fluorescence of resin. |
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Found one-to-one correspondence of fluorescence intensity ratio with conversion (0-100%) allowing for robust cure monitoring. |
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Physical aging of fully-cured resin may be monitored with fluorescence intensity ratio. |
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Demonstrated feasibility of cure monitoring via fiber-optic based fluorescence using commerical instrumentation. |
Fiber-optic Monitoring Equipment
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Fiber-optic
Ultrasound Sensors for Process Monitoring
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Objectvie: Integrate fiber-optic ultrasound cure monitoring system with RTM. Such a system can be used at higher temperaturee than pzt-based systems. |
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| Accomplishments: Distributed broadband Sagnac ultrasound sensor with enhanced sensitivity designed and characterized. | |
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First prototype of a local Bragg-grating ultrasound sensor devised. |
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Fiber-optic Ultrasound Generators devised. |
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Sagnac sensor embedded into a composite ply and tested in the presence of high temperature and pressure that prevail inside an RTM setup. |
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A new instrumented model has been designed and constructed. This mold contains ports for bringing the Sagnac sensor into the mold cavity. The top half of the mold also contains a new system for fiber-optic ultrasound generation. |
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Preliminary results for cure monitoring using the above instrumented RTM setup have been obtained. |
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Integration
of Laser Based Ultrasound System in RTM Environment
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| Cure monitoring with Fiberoptic Ultrasonic sensors | |
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Cure
Monitoring
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INFER:
ADVANTAGE: monitor cure at any selected layer rather than get a through-thickness average measurement |
