Study of Material Evaluation Probe Using a Longitudinal Wave and a Transverse Wave

Riichi Murayama, Makiko Kobayashi, Cheng-Kuei Jen

Department of Computer Science and Electrical Engineering, Kumamoto University, Kumamoto, Japan.
Department of Intelligent Mechanical Engineering, Fukuoka Institute of Technology, Fukuoka, Japan.
Mcgill University, Montreal, Canada.

DOI: 10.4236/jst.2013.32005                

Abstract

Transmitting a longitudinal wave and a traverse wave into a composite material in a molten state has been studied in the online control of the composite material which cannot be evaluated by a conventional ultrasonic sensor as a final analysis, using the difference in the propagation characteristics of both modes. It is especially expected that measurement of the physical quantity which was not able to be conventionally measured can be performed by carrying out coincidence measurement of the ultrasonic wave in both modes. Therefore, in this research study, an ultrasonic probe, which can simultaneously transmit and receive a longitudinal wave and a traverse wave has been developed using an electromagnetic acoustic transducer (EMAT) because it has the advantage of measuring high temperature samples. In this study, two methods have been compared. The 1st method uses a traverse wave EMAT that travels in a vertical direction and a bar wave by which the low order mode is equivalent to longitudinal wave vibration. The other method is to carry out the mode conversion of the traverse wave by a traverse wave-EMAT. The longitudinal converted from the transverse wave are spread in the axis direction. As the experimental results of both optimizations of the drive conditions, it has been confirmed that the 2nd mode conversion method was promising. This paper reports about the trial process and the experimental results.

Keywords

Longitudinal Wave; Transverse Wave; Material Property Evaluation; High Temperature Measurement

Conflicts of Interest

The authors declare no conflicts of interest.

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