Investigation of embedded Near Infrared Fibre Bragg Grating (FBG)sensors (830 nm) in structural health monitoring of glass fibre composite structures

摘要

The transmitted spectrums of conventional FBG sensors operating in near infrared region (Bragg wavelength — 830nm) embedded in E-GlassNinylester composite sample were investigated at static and after fatigue loading. Also transmitted waveforms of a FBG attached to a surface of single layer E-Glass/Vinylester composite sample which has a purposely created hole closer to attached FBG sensor were examined in order to understand the FBG response in a vicinity of a void/damage, under static loading situation. As a consequence, some conclusions were made on the sensitivity and durability of the use of FBG sensors fabricated by conventional writing techniques in long term health monitoring system of composite structures.