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Appl. Sci. 2018, 8(8), 1315; https://doi.org/10.3390/app8081315

Ultrasonic Guided Wave-Based Circumferential Scanning of Plates Using a Synthetic Aperture Focusing Technique

1
State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
2
Institute of Advanced Digital Technologies and Instrumentation, School of Biomedical Engineering and Instrument Science, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
*
Author to whom correspondence should be addressed.
Received: 11 July 2018 / Revised: 28 July 2018 / Accepted: 6 August 2018 / Published: 7 August 2018
(This article belongs to the Special Issue Ultrasonic Guided Waves)
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Abstract

Tanks are essential facilities for oil and chemical storage and transportation. As indispensable parts, the tank floors have stringent nondestructive testing requirements owing to their severe operating conditions. In this article, a synthetic aperture focusing technology method is proposed for the circumferential scanning of the tank floor from the edge outside the tank using ultrasonic guided waves. The zeroth shear horizontal (SH0) mode is selected as an ideal candidate for plate inspection, and the magnetostrictive sandwich transducer (MST) is designed and manufactured for the generation and receiving of the SH0 mode. Based on the exploding reflector model (ERM), the relationships between guided wave fields at different radii of polar coordinates are derived in the frequency domain. The defect spot is focused when the sound field is calculated at the radius of the defect. Numerical and experimental validations are performed for the defect inspection in an iron plate. The angular bandwidth of the defect spot is used as an index for the angular resolution. The results of the proposed method show significant improvement compared to those obtained by the B-scan method, and it is found to be superior to the conventional method—named delay and sum (DAS)—in both angular resolution and calculation efficiency. View Full-Text
Keywords: SH0 mode; circumferential scanning; synthetic aperture focusing; exploding reflector model SH0 mode; circumferential scanning; synthetic aperture focusing; exploding reflector model
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Wu, J.; Tang, Z.; Yang, K.; Wu, S.; Lv, F. Ultrasonic Guided Wave-Based Circumferential Scanning of Plates Using a Synthetic Aperture Focusing Technique. Appl. Sci. 2018, 8, 1315.

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