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Abstract
This article demonstrates the use of an embedded fiber Bragg grating sensor for strain measurement at different directions to the loading axis of a fiber-reinforced polymer laminate. Four 16-layer samples have been fabricated with glass cloth and epoxy resin with the fiber Bragg gratings embedded at different angles. The fiber Bragg gratings were interrogated with the help of a paired long-period grating to convert the wavelength change into an optical intensity change. It has been seen that there is a ~30% decrease of strain at 30° and a ~90% decrease at 60° to the loading direction for an applied strain in the range of 0–9,000 μstrain.
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Notes on contributors
Mainak Basu
Mainak Basu is currently a Ph.D. student at the Department of Electronics & Communication Engineering in Birla Institute of Technology, Mesra. He obtained his M.Sc. in Instrumentation from Jadavpur University, India, in 2010. He has participated in a project on embedded fiber-optic sensor-based structural health monitoring. His research interests include optical sensing for advanced avionics and advanced AI-based robot navigation.
S. K. Ghorai
S. K. Ghorai received his M.Sc.Tech. and Ph.D. in Optics and Optoelectronics from the University of Calcutta, India, in 1983 and 2001, respectively. He is currently a Professor in the Department of Electronics & Communication Engineering at Birla Institute of Technology, Mesra, Ranchi. He has undertaken several sponsored projects relating to optical sensing. His topics of interest are optical fibers sensors & instrumentation, non-linear optics, optical networking, and data communication.