A Fresnel's Reflection Optical Fiber Sensor for Thermoset Polymer Cure Monitoring

Author:

Vacher S.1,Molimard J.1,Gagnaire H.2,Vautrin A.1

Affiliation:

1. Mechanical and Materials Engineering Department, SMS Division, Ecole Nationale Supέrieure des Mines de Saint-Etienne, F-42023 Saint-Etienne cedex 2, France

2. Laboratoire Traitement du Signal et Instrumentation, Universitέ Jean Monnet UMR CNRS 5516, 42023 Saint-Etienne Cedex 2, France

Abstract

The paper presents a novel optical sensor that can perform real-time measurements of the degree of cure of an epoxy resin used as a matrix in fiber reinforced polymer composites. This sensor is based on the Fresnel's reflection at the end of an optical fiber. An increase in the degree of cure induces a corresponding increase in the density of the resin and therefore an increase in the measured reflected light intensity. The response of this optical sensor is shown to be in agreement with a well-established method, namely the Differential Scanning Calorimetry (DSC). In addition, a calibration method for the optical sensor in service is proposed. This calibration takes advantage of the heating phase of the epoxy resin at the beginning of the process. Due to its low intrusivity, this sensor can be easily embedded into a composite material to monitor the resin cure in-situ.

Publisher

SAGE Publications

Subject

Materials Chemistry,Polymers and Plastics,Ceramics and Composites

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