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Sensors 2017, 17(6), 1285; doi:10.3390/s17061285

The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures

1
College of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
2
Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 8608555, Japan
*
Author to whom correspondence should be addressed.
Received: 12 May 2017 / Revised: 28 May 2017 / Accepted: 31 May 2017 / Published: 4 June 2017
(This article belongs to the Section Physical Sensors)
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Abstract

In this study, a flexible ultrasonic transducer (FUT) was applied in a laser ultrasonic technique (LUT) for non-destructive characterization of metallic pipes at high temperatures of up to 176 °C. Compared with normal ultrasound transducers, a FUT is a piezoelectric film made of a PZT/PZT sol-gel composite which has advantages due to its high sensitivity, curved surface adaptability and high temperature durability. By operating a pulsed laser in B-scan mode along with the integration of FUT and LUT, a multi-mode dispersion spectrum of a stainless steel pipe at high temperature can be measured. In addition, dynamic wave propagation behaviors are experimentally visualized with two dimensional scanning. The images directly interpret the reflections from the interior defects and also can locate their positions. This hybrid technique shows great potential for non-destructive evaluation of structures with complex geometry, especially in high temperature environments. View Full-Text
Keywords: flexible ultrasonic transducer; laser ultrasonic technique; laser ultrasonic visualization; material characterization; defect detection; Non-destructive testing; high temperature measurement flexible ultrasonic transducer; laser ultrasonic technique; laser ultrasonic visualization; material characterization; defect detection; Non-destructive testing; high temperature measurement
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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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Wu, T.C.; Kobayashi, M.; Tanabe, M.; Yang, C.H. The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures. Sensors 2017, 17, 1285.

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