Significant progress has been made in recent years on the design and deployment of optical fibre-based sensors to monitor the cross-linking (cure) reactions in thermosetting resins. In the current study, the following sensor designs were used to study cross-linking reactions of an epoxy/amine resin system: (i) intensity-based Fresnel sensors, (ii) extrinsic fibre Fabry-Perot interferometic (EFPI) sensors, (iii) fibre Bragg grating (FBG) sensors and (iv) sensor designs to enable transmission, reflection and evanescent wave spectroscopy.
This paper presents a detailed study on a comparison of the above-mentioned techniques for a commercially available epoxy/amine resin system. Conventional Fourier transform infrared spectroscopy was used as the reference method for obtaining quantitative data on the cross-linking kinetics. The shrinkage of the resin during cross-linking was monitored using EFPI and FBG sensors. This paper also discusses the cross-linking data obtained using optical fibre-based evanescent wave spectroscopy.
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Wang, L., Machavaram, V.R., Mahendran, R., Harris, D., Pandita, S.D., Tomlin, A., Redmore, E., Malik, S.A. and Fernando, G.F., 2009, March. A comparison of cure monitoring techniques. In SPIE Smart Structures and Materials+ Nondestructive Evaluation and Health Monitoring (pp. 729213-729213). International Society for Optics and Photonics.
Categories: Photonics & Optoelectronics