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Title: Hybrid active focusing with adaptive dispersion for higher defect sensitivity in guided wave inspection of cylindrical structures
Authors: Lowe, PS
Sanderson, R
Boulgouris, NV
Gan, TH
Keywords: Ultrasonic guided waves;Active focusing;Defect sensitivity;Finite element analysis;Pipe inspection
Issue Date: 2015
Publisher: Taylor & Francis
Citation: Nondestructive Testing and Evaluation, (2015)
Abstract: Ultrasonic guided wave inspection is widely used for scanning prismatic structures such as pipes for metal loss. Recent research has investigated focusing the sound energy into predetermined regions of a pipe in order to enhance the defect sensitivity. This paper presents an active focusing technique which is based on a combination of numerical simulation and time reversal concept. The proposed technique is empirically validated using a 3D laser vibrometry measurement of the focal spot. The defect sensitivity of the proposed technique is compared with conventional active focusing, time reversal focusing and synthetic focusing through an empirically validated finite element parametric study. Based on the results, the proposed technique achieves approximately 10 dB improvement of signal-to-coherent-noise ratio compared to the conventional active focusing and time reversal focusing. It is also demonstrated that the proposed technique to have an amplitude gain of around 5 dB over synthetic focusing for defects <0.5λs. The proposed technique is shown to have the potential to improve the reliably detectable flaw size in guided wave inspection from 9% to less than 1% cross-sectional area loss.
ISSN: 1477-2671
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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