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Sensors 2016, 16(10), 1737; doi:10.3390/s16101737

Mode Conversion Behavior of Guided Wave in a Pipe Inspection System Based on a Long Waveguide

1
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2
Yangtze Delta Region Institute of Tsinghua University, Jiaxing 314006, China
3
Department of Intelligent Mechanical Engineering, Fukuoka Institute of Technology, Fukuoka 811-0295, Japan
4
Graduate School of Advanced Technology and Science, Tokushima University, Minami-Josanjima, Tokushima 770-8506, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Dipen N. Sinha and Cristian Pantea
Received: 22 August 2016 / Revised: 20 September 2016 / Accepted: 27 September 2016 / Published: 19 October 2016
(This article belongs to the Special Issue Ultrasonic Sensors)
View Full-Text   |   Download PDF [8599 KB, uploaded 19 October 2016]   |  

Abstract

To make clear the mode conversion behavior of S0-mode lamb wave and SH0-plate wave converting to the longitudinal mode guided wave and torsional mode guided wave in a pipe, respectively, the experiments were performed based on a previous built pipe inspection system. The pipe was wound with an L-shaped plate or a T-shaped plate as the waveguide, and the S0-wave and SH0-wave were excited separately in the waveguide. To carry out the objective, a meander-line coil electromagnetic acoustic transducer (EMAT) for S0-wave and a periodic permanent magnet (PPM) EMAT for SH0-wave were developed and optimized. Then, several comparison experiments were conducted to compare the efficiency of mode conversion. Experimental results showed that the T(0,1) mode, L(0,1) mode, and L(0,2) mode guided waves can be successfully detected when converted from the S0-wave or SH0-wave with different shaped waveguides. It can also be inferred that the S0-wave has a better ability to convert to the T(0,1) mode, while the SH0-wave is easier to convert to the L(0,1) mode and L(0,2) mode, and the L-shaped waveguide has a better efficiency than T-shaped waveguide. View Full-Text
Keywords: mode conversion; waveguide; guided wave; EMAT; pipe inspection mode conversion; waveguide; guided wave; EMAT; pipe inspection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sun, F.; Sun, Z.; Chen, Q.; Murayama, R.; Nishino, H. Mode Conversion Behavior of Guided Wave in a Pipe Inspection System Based on a Long Waveguide. Sensors 2016, 16, 1737.

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