Journal Article10.12989/SSS.2012.9.5.461
Damage detection for pipeline structures using optic-based active sensing
Hyeonseok Lee,Hoon Sohn +1 more
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TL;DR: In this paper, an active sensing system for continuous monitoring of underground pipelines in nuclear power plants (NPPs) is proposed, which uses a single laser source and optical cables.
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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.
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Citations
Application of FBG Based Sensor in Pipeline Safety Monitoring
TL;DR: In this article, a fiber Bragg grating (FBG) strain hoop sensor was proposed to detect pipeline leakage and corrosion simultaneously based on hoop strain measurement, which is an effective indicator to reflect the inner pressure fluctuation and the wall thickness reduction of the pipeline.
59
Experimental investigations on detecting lateral buckling for subsea pipelines with distributed fiber optic sensors
TL;DR: In this paper, the Brillouin optical time domain analysis (BOTDA) distributed sensors are mounted on the outer surface of the pipeline and the bending-induced strain is extracted to detect the occurrence and evolution of lateral buckling.
42
Piezoelectric transducers for assessing and monitoring civil infrastructures
Yun-Kyu An,Minkoo Kim,Hoon Sohn +2 more
- 01 Jan 2014
TL;DR: In this paper, the basic principles of piezoelectric transducers and the characteristics of PEG materials are discussed, and various PEG transducer-based structural health monitoring (SHM) methodologies including guided wave, impedance, and acoustic emission techniques are summarized.
38
Calculus of the defect severity with EMATs by analysing the attenuation curves of the guided waves
TL;DR: In this paper, the authors present a fault detection and diagnosis approach employing a new electromagnetic acoustic transducer, called EMAT, together with a complex signal processing method to determine the severity of a damage in a thin plate.
21
An Autonomous Strain-Based Structural Monitoring Framework for Life-Cycle Analysis of a Novel Structure
TL;DR: In this article, a nonparametric and a parametric output-only method, namely a Principal Component Analysis (PCA) scheme versus a Vector AutoRegressive (VAR) model, are employed and compared.
References
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Zhongqing Su,Lin Ye,Ye Lu +2 more
TL;DR: A comprehensive review on the state of the art of Lamb wave-based damage identification approaches for composite structures, addressing the advances and achievements in these techniques in the past decades, is provided in this paper.
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Rayleigh and Lamb Waves : Physical Theory and Applications
Igor Aleksandrovich Viktorov
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Defect detection in pipes using guided waves
TL;DR: In this paper, the authors present a review of the studies of the propagation of the waves and their sensitivity to defects which have been conducted in order to provide a sound scientific basis for the method.
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An investigation into the performance of macro-fiber composites for sensing and structural vibration applications
TL;DR: In this article, the use of macro-fiber composites (MFC) for vibration suppression and structural health monitoring has been presented, where an MFC could be used as a sensor and actuator to find modal parameters of an inflatable structure.
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Acousto-ultrasonic sensing using fiber Bragg gratings
TL;DR: In this paper, a fiber-optic system based on fiber Bragg grating sensors is proposed to detect ultrasonic Lamb waves in aircraft structures, in particular aircraft structural structures.
308