Affiliations: [a] Graduate School of Engineering, Tohoku University, Japan | [b] Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, Miyagi 980-8577, Japan | [c] ELyTMaX UMI 3757, CNRS, Université de Lyon, International Joint Unit, Tohoku University, Sendai 980-8577, Japan | [d] Chair of NDT and Quality Assurance, Saarland University, Germany
Correspondence:
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Corresponding author: T. Uchimoto, Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, Miyagi 980-8577, Japan and ELyTMaX UMI 3757, CNRS, Université de Lyon, International Joint Unit, Tohoku University, Sendai 980-8577, Japan. Tel.: +81 (0)22 217 5262; E-mail: uchimoto@ifs.tohoku.ac.jp
Abstract: An electromagnetic acoustic transducer (EMAT) design using an air-cored solenoid coil as a pulsed electromagnet is proposed for the high-temperature non-contact monitoring of metal processing, and the operation of a prototype device is confirmed at temperatures ranging from room temperature to 700 °C. The coil generates a biasing magnetic field that allows the device to overcome the Curie temperature limitations of conventional EMATs. Pulse-echo measurements on carbon steel are made at high temperatures, and the superposition of the nth compression method is used as a signal processing technique to confirm that the shear wave velocity decreases with increasing temperature, and it is verified that the EMAT can operate at high temperature.
Keywords: Electromagnetic acoustic transducer, high-temperature environment, signal processing, pulsed magnet
