Location

Snowmass Village, CO

Start Date

1-1-1995 12:00 AM

Description

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.

Volume

14B

Chapter

Chapter 6: Material Properties

Section

Mostly Metals

Pages

1601-1608

DOI

10.1007/978-1-4615-1987-4_205

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Absolute Measurement of Ultrasonic Attenuation by Electromagnetic Acoustic Resonance

Snowmass Village, CO

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.