Transmission of a Narrow Beam of Sound across the Boundary between Two Fluids

  • H. O. Berktay
  • A. H. A. Moustafa
Part of the NATO Conference Series book series (NATOCS, volume 5)


In studying shallow penetration of acoustic waves into saturated marine sediments, narrow beams of sound (at kHz frequencies) have been used under controlled conditions, (Muir, Horton, and Thompson. J. Sound & Vibration, 64, June 1979). In order to contribute to the understanding of the physical basis of the penetration of sound across the boundary, a model experiment was devised at a frequency of about 1 Mhz, using two non-mixing liquids. This paper presents the experimental results obtained and compares these results with a theoretical development. The theory developed also provides a means of understanding some of the effects observed by Muir and co-workers when a parametric source was used for penetration into a saturated sediment.


Transit Time Total Internal Reflection Beam Pattern Grazing Angle Narrow Beam 
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  1. 1.
    L A Thompson and T G Muir, “Narrow-beam sound fields in a sand sediment,” J. Acoust. Soc. Amer. 55, 429(A) (1974).Google Scholar
  2. 2.
    H O Berktay, B S Cooper and B V Smith, Unpublished results.Google Scholar
  3. 3.
    L M Brekhovskikh, “Waves in Layered Media,” Academic Press, New York (1960).Google Scholar
  4. 4.
    E Gerjouy, “Refraction of waves from a point source into a medium of higher velocity”, Phys. Rev., 73, 1442 (1948).CrossRefGoogle Scholar
  5. 5.
    If the angle tan-1 (X/H) is greater than sin-1 n, another saddle point may exist, leading to a ‘lateral wave’ component in addition to the ‘refracted wave’ arising from θo.Google Scholar
  6. 6.
    G W C Kaye and T H Laby, “Tables of Physical and Chemical Constants and Some Mathematical Functions,” Longman, London (1973).Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • H. O. Berktay
    • 1
  • A. H. A. Moustafa
    • 1
  1. 1.School of PhysicsUniversity of BathBathUK

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