New Developments in Fast and Recordable Surface Inspection Using Electromagnetic Acoustic Transducer (EMAT) Techniques

Electromagnetic acoustic transducers (EMAT) is a very efficient tool to generate surface waves without couplant. The advantages include the ability to inspect very hot or cold materials, ease of integration in automated environments, and a significant increase in repeatability and reliability when compared with conventional piezoelectric transducers. In this paper, we introduce the principles of EMAT, different configurations of transducers, instrumentation options and practical applications. Sample results of real-life applications using portable and automated, in-line EMAT systems are also presented.

1. Hirao, M. and H. Ogi, EMATs for Science and Industry, Kluwer Academic Publishers, Boston, 2003. 2. Thompson, R.B., “Physical Principles of Measurements with EMAT Transducers,” in Ultrasonic Measurement Methods, edited by R.N. Thurston and A.D. Pierce, in the series of Physical Acoustics, Volume XIX, Academic Press, Boston, 1990. 3. ASTM standard E1962-09, “Standard Practice for Ultrasonic Surface Testing Using Electromagnetic Acoustic Transducer (EMAT) Techniques,” ASTM Book of Standards, Vol. 03.03. 4. Innerspec Technologies, Standard Sensors and Accessories for EMAT Applications, Rev. T-SA-J12, 2012. 5. Innerspec Technologies, Instrumentation for High-Power Ultrasonic Applications, Rev. T-I-B12, 2012.
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