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Proceedings Paper

In-situ characterization of resin chemistry with infrared transmitting optical fibers and infrared spectroscopy
Author(s): Mark A. Druy; Paul J. Glatkowski; William A. Stevenson
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Paper Abstract

The real-time in situ monitoring of the chemical states of epoxy and polyimide resins were investigated during cure using an embedded fiber optic sensor and a Fourier transform infrared spectrometer (FTIR). In this work a short length of sapphire fiber is used as the sensor for monitoring the cure of the epoxy, while for the polyimide resin, we use a chalcogenide fiber as the sensor. The cure of the epoxy resin/graphite fiber composite is monitored in an autoclave, while the cure of the polyimide resin/graphite fiber composite is monitored in a high temperature press. The sapphire sensor is connected to infrared transmitting zirconium fluoride optical fiber cables which penetrate the wall of the autoclave and interface to the FTIR spectrometer. The chalcogenide sensor connects to other chalcogenide fibers which act as a transmission link to the FTIR spectrometer. The results indicate that this equipment and sensors are suitable for monitoring the degree of cure of the laminates throughout the entire cure cycle.

Paper Details

Date Published: 1 April 1991
PDF: 9 pages
Proc. SPIE 1437, Applied Spectroscopy in Material Science, (1 April 1991); doi: 10.1117/12.45132
Show Author Affiliations
Mark A. Druy, Foster-Miller, Inc. (United States)
Paul J. Glatkowski, Foster-Miller, Inc. (United States)
William A. Stevenson, Foster-Miller, Inc. (United States)


Published in SPIE Proceedings Vol. 1437:
Applied Spectroscopy in Material Science
David D. Saperstein, Editor(s)

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