Smart Structures and Systems

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Damage detection for pipeline structures using optic-based active sensing

  • Lee, Hyeonseok (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Sohn, Hoon (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2011.07.26
  • Accepted : 2012.04.20
  • Published : 2012.05.25
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Abstract

This study proposes an optics-based active sensing system for continuous monitoring of underground pipelines in nuclear power plants (NPPs). The proposed system generates and measures guided waves using a single laser source and optical cables. First, a tunable laser is used as a common power source for guided wave generation and sensing. This source laser beam is transmitted through an optical fiber, and the fiber is split into two. One of them is used to actuate macro fiber composite (MFC) transducers for guided wave generation, and the other optical fiber is used with fiber Bragg grating (FBG) sensors to measure guided wave responses. The MFC transducers placed along a circumferential direction of a pipe at one end generate longitudinal and flexural modes, and the corresponding responses are measured using FBG sensors instrumented in the same configuration at the other end. The generated guided waves interact with a defect, and this interaction causes changes in response signals. Then, a damage-sensitive feature is extracted from the response signals using the axi-symmetry nature of the measured pitch-catch signals. The feasibility of the proposed system has been examined through a laboratory experiment.

Keywords

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