A MEASUREMENT OF THE EFFECT OF ATMOSPHERIC TURBULENCE ON THE COHERENT PROPERTIES OF A SOUND WAVE,

Abstract

This report describes an experiment to measure with an acoustic diffraction grating the fluctuations of a sound wave due to atmospheric turbulence. The grating corresponds to a bandpass filter with a bandwidth of 10-(2) cm-(1) in wave number. The measurement is related to the scattering of electromagnetic energy by periodic sound waves, an effect upon which the EMAC probe depends. Measurements were made at an acoustic wave length of 3.48 cm. Under the conditions of the tests, turbulence was found to have no effect on the sound wave. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1965
Accession Number
AD0455968

Entities

People

  • John W. Coffman

Tags

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Atmospheric Motion
  • Bandpass Filters
  • Diffraction
  • Electromagnetic Radiation
  • Gratings (Spectra)
  • Measurement
  • Scattering
  • Sound Waves
  • Turbulence
  • Waves

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Dynamics.
  • Optical Physics and Photonics.