• Title/Summary/Keyword: 구조건 전성감시

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Simultaneous Measurement of Strain and Damage Signal in Composite Structures Using a Fiber Bragg Grating Sensor (광섬유 브래그 격자 센서를 이용한 복합재 구조물의 변형률 및 파손신호 동시 측정)

  • Koh, Jong-In;Bang, Hyung-Joon;Kim, Chun-Gon;Hong, Chang-Sun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.7
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    • pp.43-50
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    • 2004
  • For the simultaneous measurement of strain and damage signal a fiber Bragg grating sensor system with a dual demodulator was proposed. The dual demodulator is composed of a demodulator using a tunable Fabry-Perot filter measuring the low-frequency signal with large magnitude such as strain and the other using a passive Mach-Zehnder interferometer detecting the high-frequency signal with small amplitude such as impact or damage signal. Using the proposed fiber Bragg grating sensor system, both the strain and damage signals of a cross-ply laminated composite beam under tensile loading were simultaneously measured. The strain and damage signals detected by single fiber Bragg grating sensor showed that sudden strain shifts were accompanied with vibration at a maximum frequency of several hundreds of kilohertz at the instant of matrix crack propagation in the 90 degree layer in composite beam.