SELECTED STUDIES IN MICROWAVE ACOUSTICS.

Abstract

Controlled steering of the direction of a microwave acoustic beam in a ferrite by variation of the magnitude of the dc applied magnetic field was demonstrated. In a ferrimagnetic medium the interaction of acoustic waves with spin waves induces a deviation of the group velocity away from the phase velocity. This effect was demonstrated experimentally by the observation of pulse transmission between offset piezoelectric transducers on the ends of an yttrium iron garnet rod. Transmission occurs under the theoretically predicted conditions on magnetic field intensity and direction. The power-output versus frequency of multiple film hypersonic transducers was calculated by separate computer programs for certain specialized film configurations. A more generalized computer program was developed which is capable of treating configurations of films which are completely arbitrary with respect to material, physical thickness, and ordering of films used. This program assumes no power loss in the materials. Examples of the results of this program are described. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1965
Accession Number
AD0628305

Entities

People

  • H. J. Shaw

Tags

DTIC Thesaurus Topics

  • Acoustic Beams
  • Acoustic Waves
  • Acoustics
  • Computer Programs
  • Computers
  • Frequency
  • Group Velocity
  • Magnetic Fields
  • Materials
  • Microwaves
  • Phase Velocity
  • Piezoelectric Transducers
  • Spin Waves
  • Transducers
  • Waves
  • Yttrium Iron Garnet

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Materials Science and Engineering.
  • Phased Array Antenna Design.

Technology Areas

  • Hypersonics