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Published February 1968 | Published
Journal Article Open

A two-dimensional ultrasonic model study of compressional and shear-wave diffraction patterns produced by a circular cavity

Abstract

Diffraction patterns of compressional (P) and shear (SV) waves produced by a circular hole were experimentally obtained on a two-dimensional ultrasonic model. The shapes of the Fresnel patterns were found to depend on, 1) α/λ, the ratio of the radius of the cylinder to the wavelength; and, 2) the wave type. The transitional zone between the illuminated and the shadow regions broadens, and the half-amplitude point shifts away from the geometrical shadow as α/λ decreases. For comparable α/λ, the shadow boundary of the SV wave appears to start much earlier than that of the P wave.

Additional Information

Copyright © 1968, by the Seismological Society of America. Manuscript received June 12, 1967. Research sponsored by the Air Force Office of Scientific Research, Office of Aerospace Research, United States Air Force, under AFOSR contract number AF-49(638)-1337. We would like to thank Dr. Robert A. Phinney for an advance copy of his manuscript, and Dr. Den L. Anderson for several valuable suggestions.

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August 19, 2023
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October 26, 2023