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Sensors 2018, 18(3), 752; https://doi.org/10.3390/s18030752

Development of a Flexible Broadband Rayleigh Waves Comb Transducer with Nonequidistant Comb Interval for Defect Detection of Thick-Walled Pipelines

College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China
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Received: 27 December 2017 / Revised: 13 February 2018 / Accepted: 26 February 2018 / Published: 2 March 2018
(This article belongs to the Section Physical Sensors)
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Abstract

It is necessary to develop a transducer that can quickly detect the inner and outer wall defects of thick-walled pipes, in order to ensure the safety of such pipes. In this paper, a flexible broadband Rayleigh-waves comb transducer based on PZT (lead zirconate titanate) for defect detection of thick-walled pipes is studied. The multiple resonant coupling theory is used to expand the transducer broadband and the FEA (Finite Element Analysis) method is used to optimize transducer array element parameters. Optimization results show that the best array element parameters of the transducer are when the transducer array element length is 30 mm, the thickness is 1.2 mm, the width of one end of is 1.5 mm, and the other end is 3 mm. Based on the optimization results, such a transducer was fabricated and its performance was tested. The test results were consistent with the finite-element simulation results, and the −3 dB bandwidth of the transducer reached 417 kHz. Transducer directivity test results show that the Θ−3dB beam width was equal to 10 °, to meet the defect detection requirements. Finally, defects of thick-walled pipes were detected using the transducer. The results showed that the transducer could detect the inner and outer wall defects of thick-walled pipes within the bandwidth. View Full-Text
Keywords: comb transducer; Rayleigh waves; broadband transducer; thick-walled pipes comb transducer; Rayleigh waves; broadband transducer; thick-walled pipes
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Zhao, H.; He, C.; Yan, L.; Zhang, H. Development of a Flexible Broadband Rayleigh Waves Comb Transducer with Nonequidistant Comb Interval for Defect Detection of Thick-Walled Pipelines. Sensors 2018, 18, 752.

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