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Appl. Sci. 2015, 5(4), 1715-1734; doi:10.3390/app5041715

Electromagnetic Acoustic Transducers Applied to High Temperature Plates for Potential Use in the Solar Thermal Industry

1
Brunel Innovation Centre (BIC), Brunel University, Cambridge CB21 2AL, UK
2
TWI Ltd., Granta Park, Great Abington, Cambridge CB21 6AL, UK
This paper is an extended version of paper published in the 6th International Conference on Emerging Technologies in Non-destructive Testing (ETNDT6), Brussels, Belgium, 27–29 May 2015.
*
Authors to whom correspondence should be addressed.
Academic Editor: Dimitrios G. Aggelis
Received: 24 September 2015 / Revised: 3 December 2015 / Accepted: 4 December 2015 / Published: 11 December 2015
(This article belongs to the Special Issue Acoustic and Elastic Waves: Recent Trends in Science and Engineering)
View Full-Text   |   Download PDF [2840 KB, uploaded 11 December 2015]   |  

Abstract

Concentrated Solar Plants (CSPs) are used in solar thermal industry for collecting and converting sunlight into electricity. Parabolic trough CSPs are the most widely used type of CSP and an absorber tube is an essential part of them. The hostile operating environment of the absorber tubes, such as high temperatures (400–550 °C), contraction/expansion, and vibrations, may lead them to suffer from creep, thermo-mechanical fatigue, and hot corrosion. Hence, their condition monitoring is of crucial importance and a very challenging task as well. Electromagnetic Acoustic Transducers (EMATs) are a promising, non-contact technology of transducers that has the potential to be used for the inspection of large structures at high temperatures by exciting Guided Waves. In this paper, a study regarding the potential use of EMATs in this application and their performance at high temperature is presented. A Periodic Permanent Magnet (PPM) EMAT with a racetrack coil, designed to excite Shear Horizontal waves (SH0), has been theoretically and experimentally evaluated at both room and high temperatures. View Full-Text
Keywords: Electromagnetic Acoustic Transducer (EMAT); guided waves; solar thermal plants; non-destructive testing; high temperatures Electromagnetic Acoustic Transducer (EMAT); guided waves; solar thermal plants; non-destructive testing; high temperatures
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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

Kogia, M.; Cheng, L.; Mohimi, A.; Kappatos, V.; Gan, T.-H.; Balachandran, W.; Selcuk, C. Electromagnetic Acoustic Transducers Applied to High Temperature Plates for Potential Use in the Solar Thermal Industry. Appl. Sci. 2015, 5, 1715-1734.

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