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Journal of the Acoustical Society of America

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Dec 1960

Volume 32, Issue 12, pp. 1529-1701

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Improvements in the Sing‐Around Technique for Ultrasonic Velocity Measurements

R. L. Forgacs

J. Acoust. Soc. Am. Volume 32, Issue 12, pp. 1697-1698 (1960); (2 pages) | Cited 3 times

Online Publication Date: 11 Jul 2005

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A highly sensitive sing‐around system was developed for ultrasonic velocity measurements in solids. In the developed system, a selected cycle of a selected echo is gated out, to retrigger the transmitter. Highly stable circuitry is employed. The timing system incorporates two modified commercial electronic counters and associated circuitry to maximize stability and detection sensitivity. Environmentally induced sample velocity changes of the order one part in 107 may be detected, provided that the accompanying attenuation change is negligible, or that steps taken to compensate for ultrasonic attenuation changes by adjusting electronic attenuation, produce phase shifts which are known to sufficient accuracy.

Method for Measuring Attenuation of Ultrasonic Longitudinal Waves in Plastics and Rocks

Michel Auberger and John S. Rinehart

J. Acoust. Soc. Am. Volume 32, Issue 12, pp. 1698-1699 (1960); (2 pages) | Cited 1 time

Online Publication Date: 11 Jul 2005

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An extension of Hughes pulse technique is described for measuring attenuation of ultrasonic longitudinal waves in plastics and range: 250 kc–1000 kc.

Corrected Values of the Elastic Moduli of Sapphire

Walter G. Mayer and E. A. Hiedemann

J. Acoust. Soc. Am. Volume 32, Issue 12, pp. 1699-1700 (1960); (2 pages) | Cited 1 time

Online Publication Date: 11 Jul 2005

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Corrected values of the elastic moduli of sapphire are given based on earlier work of the authors but using more accurate crystal orientations.

Effects of Dynamical Nonlinearity on Extremal Statistics

D. A. Smith and R. F. Lambert

J. Acoust. Soc. Am. Volume 32, Issue 12, pp. 1700-1701 (1960); (2 pages)

Online Publication Date: 11 Jul 2005

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Experimental studies of the probability distribution of strain extrema resulting from nonlinear random vibrations of an elastic bar are here reported. The distribution of extrema are found to deviate from a Rayleigh distribution which holds experimentally for linear motion. Of particular interest are large strain levels where the distribution of maxima fall above a Rayleigh distribution while the minima lie below.

Erratum: Sound Field of a Rectangular Piston [J. Acoust. Soc. Am. 32, 197 (1960)]

A. Freedman

J. Acoust. Soc. Am. Volume 32, Issue 12, pp. 1701-1701 (1960); (1 page)

Online Publication Date: 11 Jul 2005

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