Sound Propagation Into the Shadow Zone in a Temperature-Stratified Atmosphere Above a Plane Boundary

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Description

Note presenting an investigation of the sound field about a point source over a plane boundary in the presence of a vertical temperature gradient, which represents one phase of a general program of research in atmospheric acoustics. In this report, geometrical ray acoustics is employed to derive the ray paths and intensity distribution about a source located in a uniformly stratified medium. Results indicate that the existence of a temperature gradient, which leads only to a simple refraction of sound rays, can be in conjunction with the ground boundary result in the formation of a "shadow zone".

Physical Description

57 p. : ill.

Creation Information

Pridmore-Brown, David C. & Ingard, Uno October 1955.

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This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and one other and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 142 times . More information about this report can be viewed below.

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  • Main Title: Sound Propagation Into the Shadow Zone in a Temperature-Stratified Atmosphere Above a Plane Boundary
  • Series Title: NACA Technical Notes

Description

Note presenting an investigation of the sound field about a point source over a plane boundary in the presence of a vertical temperature gradient, which represents one phase of a general program of research in atmospheric acoustics. In this report, geometrical ray acoustics is employed to derive the ray paths and intensity distribution about a source located in a uniformly stratified medium. Results indicate that the existence of a temperature gradient, which leads only to a simple refraction of sound rays, can be in conjunction with the ground boundary result in the formation of a "shadow zone".

Physical Description

57 p. : ill.

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  • Accession or Local Control No: 93R13644
  • URL: http://hdl.handle.net/2060/19930084354 External Link
  • Report No.: NACA-TN-3494
  • Center for AeroSpace Information Number: 19930084354
  • Archival Resource Key: ark:/67531/metadc57873

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National Advisory Committee for Aeronautics Collection

The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA).

Technical Report Archive and Image Library

This selection of materials from the Technical Report Archive and Image Library (TRAIL) includes hard-to-find reports published by various government agencies. The technical publications contain reports, images, and technical descriptions of research performed for U.S. government agencies. Topics range from mining, desalination, and radiation to broader physics, biology, and chemistry studies. Some reports include maps, foldouts, blueprints, and other oversize materials.

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Creation Date

  • October 1955

Added to The UNT Digital Library

  • Nov. 16, 2011, 7:33 a.m.

Description Last Updated

  • Aug. 30, 2018, 2:05 p.m.

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Pridmore-Brown, David C. & Ingard, Uno. Sound Propagation Into the Shadow Zone in a Temperature-Stratified Atmosphere Above a Plane Boundary, report, October 1955; (digital.library.unt.edu/ark:/67531/metadc57873/: accessed January 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.