A model study of acoustic reflection from a rippled water-sand interface

Download
Author
Arcuni, Philip W.
Date
1966-05Advisor
Sanders, James V.
Metadata
Show full item recordAbstract
A model experiment was performed to measure acoustic reflection
from a rippled sand surface using a pulse-echo system employing electrostatic
transducers over the frequency range 100-350 kHz. The ripple wavelength
of 1.23 cm was slightly greater than the longest acoustic wavelength
and had an amplitude to wavelength ratio of 1/10. Boiling of the
sand to remove entrapped air was essential before the scattering effects
of the ripples could be observed. The angles of propagation of the scattered
spectra are found to agree with the theoretical prediction within
+ 2°. The amplitudes of two orders of the scattered spectrum were measured
at an incident angle of 45° and compared to the theory for the
limiting condition where the ripple wavelength is very much larger than
the acoustic wavelength. Agreement was excellent for the spectral reflection,
but was not as good for the first order reflection.
Collections
Related items
Showing items related by title, author, creator and subject.
-
A preliminary study of a surface wave-acoustical normal mode resonance in a fluid-filled rectangular waveguide with pressure-release boundaries
Davis, Norman Ewing; Kenyon, Morton William (Monterey, California. Naval Postgraduate School, 1974-12);Studies of the effects of sinusoidal surface waves on the propagation of sound in a waveguide reveal a significant resonance effect under certain "matching" conditions of the wavelength of the surface wave and the wavelength ... -
Rayleigh scattering of a cylindrical sound wave by an infinite cylinder
Baynes, Alexander B.; Godin, Oleg A. (2017);Rayleigh scattering, in which the wavelength is large compared to the scattering object, is usually studied assuming plane incident waves. However, full Green?? functions are required in a number of problems, e.g., when a ... -
Audio Spotlight: How an Audio Spotlight Works [video]
Naval Postgraduate School Physics (2015);Dr. Bruce Denardo explains how a audio spotlight works and gives a jaw-dropping demonstration. The Audio spotlight is uses a set of transducers to generate a 65 kHz beam and because the wavelength of this beam is so small, ...