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Proceedings Paper

In-situ measurement of thermoset resin degree of cure using embedded fiber optic
Author(s): Giovanni Breglio; Andrea Cusano; Antonello Cutolo; Antonio Maria Calabro; Stefania Cantoni; Gandolfo Di Vita; Vincenzo Buonocore; Michele Giordano; Luigi Nicolais
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Paper Abstract

In this work, a fiber optic sensor based on Fresnel principle is presented. It is used to monitor the variations of the refractive index due to the cure process of an epoxy based resin. These materials are widely used in polymer- matrix composites. The process of thermoset matrix based composite involves mass and heat transfer coupled with irreversible chemical reactions inducing physical changes: the transformation of a fluid resin into a rubber and then into a solid glass. To improve the quality and the reliability of these materials key points are the cure monitoring and the optimization of the manufacturing process. To this aim, the fiber optic embedded sensor has been designed, developed and tested. Preliminary results on sensor capability to monitor the cure kinetics are shown. Correlation between the sensor output and conversion advancement has been proposed following the Lorentz-Lorenz law. Isothermal data form the sensor have been compared with calorimetric analysis of an epoxy based resin.

Paper Details

Date Published: 9 December 1999
PDF: 7 pages
Proc. SPIE 3859, Optical Online Industrial Process Monitoring, (9 December 1999); doi: 10.1117/12.372934
Show Author Affiliations
Giovanni Breglio, Univ. degli Studi di Napoli Federico II (Italy)
Andrea Cusano, Univ. degli Studi di Napoli Federico II (Italy)
Antonello Cutolo, Univ. degli Studi di Napoli Federico II (Italy)
Antonio Maria Calabro, Italian Aerospace Research Ctr. (Italy)
Stefania Cantoni, Italian Aerospace Research Ctr. (Italy)
Gandolfo Di Vita, Italian Aerospace Research Ctr. (Italy)
Vincenzo Buonocore, Institute of Composite Materials Technology (Italy)
Michele Giordano, Institute of Composite Materials Technology (Italy)
Luigi Nicolais, Institute of Composite Materials Technology (Italy)

Published in SPIE Proceedings Vol. 3859:
Optical Online Industrial Process Monitoring
Robert J. Nordstrom; Wim A. de Groot, Editor(s)

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