Abstracts
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Authors
Johnson, W; Auld, BA; Alers, GA
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Title
Spectroscopy of Resonant Torsional Modes in Cylindrical Rods Using Electromagnetic-Acoustic Transduction
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Journal
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Abstract:Two ultrasonic techniques employing electromagnetic acoustic transduction are presented for performing measurements of the resonance torsional frequencies and Q of solid cylindrical metallic rods. One of these techniques uses long radio frequency pulses to drive the sample into resonance and the other uses continuous wave excitation. Measurements are performed on an aluminum alloy. Since the transduction involves no mechanical coupling, the background damping is low; the Q is 1.2 x 105 at 755 kHz with the sample simply supported on its side. The shear velocity is determined with an accuracy of better than 2 parts in 104(limited by the uncertainty in the sample radius).
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