Absolute Measurement of Ultrasonic Attenuation by Electromagnetic Acoustic Resonance
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
The accurate measurement of ultrasonic attenuation is very important, since it has a great utility in the wide area of materials characterization. In this paper, a new method of measuring the attenuation is presented, which employs electromagnetic acoustic resonance (EMAR) [1–3]. The EMAR is a combination of resonance method and electromagnetic acoustic transducers (EMATs). At a resonance, many reflection echoes are coherently overlapped each other, which serves to provide an easily measurable signal intensity, compensating in excess for the inefficient transduction with EMATs. Use of a noncontacting or weakly coupling EMAT for the attenuation measurement has a pronounced advantage of eliminating the extra energy losses, which otherwise occur with the conventional contacting or immersion tests based on the piezoelectric transducers.