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Failure detection of composite structures using a fiber Bragg grating sensor  

고종인 (한국과학기술원 기계공학과)
김천곤 (한국과학기술원 기계공학)
홍창선 (한국과학기술원 기계공학과)
Publication Information
Composites Research / v.17, no.2, 2004 , pp. 28-33 More about this Journal
Abstract
Failure detection in a cross-ply laminated composite beam under tensile loading were performed using a fiber Bragg grating (FBG) sensor. A Passive Mach-Zehnder interferometric demodulator was proposed to enhance sensitivity and bandwidth. The proposed FBG sensor system without active device such as a phase modulator is very simple in configuration, easy to implement and enables the measurement of high-frequency vibration with low strain amplitude such as impact or failure signal. Failure signals detected by a FBG sensor had offset value corresponding to the strain shift with vibration at a maximum frequency of several hundreds of kilohertz. at the instant of transverse crack propagation in the 90 degree layer of composite beam.
Keywords
fiber Bragg grating; Mach-Zehnder interferometer; failure signal;
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