In-situ internal strain development and cure monitoring in a curing composite using in-fiber Bragg gratings and dielectric sensors

Martin J. O'Dwyer; G. M. Maistros; Stephen W. James; Ralph P. Tatam; I. K. Partridge

doi:10.1117/12.316469

6 July 1998 In-situ internal strain development and cure monitoring in a curing composite using in-fiber Bragg gratings and dielectric sensors

Martin J. O'Dwyer, G. M. Maistros, Stephen W. James, Ralph P. Tatam, I. K. Partridge

Author Affiliations +

Proceedings Volume 3479, Laser Interferometry IX: Applications; (1998) https://doi.org/10.1117/12.316469
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

In-fiber Bragg gratings (IFBGs) and dielectric sensors have been embedded in the same carbon fiber epoxy composite and have been used together during the curing process to make in- situ measurements of two cure parameters, namely internal strain and conductivity. This was performed using an automated acquisition system, part of which could use real-time measurements to estimate and predict cure parameters. The IFBGs were demodulated using a scanning fiber Fabry-Perot interferometer. The results obtained using this combined cure monitoring system demonstrate that it is possible to monitor the strain levels in the optical fiber resulting from the onset of liquification, gelation, and vitrification within the surrounding resin matrix.

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Martin J. O'Dwyer, G. M. Maistros, Stephen W. James, Ralph P. Tatam, and I. K. Partridge "In-situ internal strain development and cure monitoring in a curing composite using in-fiber Bragg gratings and dielectric sensors", Proc. SPIE 3479, Laser Interferometry IX: Applications, (6 July 1998); https://doi.org/10.1117/12.316469

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