Problems in Nonlinear Acoustics: Scattering of Sound by Sound, Parametric Arrays, Focused Sound Beams, and Noncollinear Tone-Noise Interactions

Abstract

Five projects are discussed involving nonlinear acoustics. (1) Scattering of Sound by Sound, a theoretical study of two noncollinear Gaussian beams which interact to produce sum and difference frequency sound. (2) Parametric Receiving Arrays, a theoretical and numerical study of parametric reception in a reverberant environment. (3) Noncollinear Interaction of a Tone with Noise, an experimental investigation of the nonlinear interaction which occurs when the two waves propagate in different modes of a rectangular duct. (4) Nonlinear Effects in Focused Sound Beams, a preliminary analytical study of harmonic generation in the focal region. (5) Parametric Ultrasonic Proximity Sensor, a numerical investigation into the use of a parametric array as an ultrasonic proximity sensor in air. Keywords: Nonlinear acoustics; Parametric array; Acoustic arrays; Scattering of sound by sound; Focused sound; Waveguide; Noise.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1988
Accession Number
ADA198755

Entities

People

  • Mark F. Hamilton

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustics
  • Background Noise
  • Classification
  • Contracts
  • Difference Frequency
  • Engineering
  • Free Field
  • Frequency
  • Frequency Bands
  • High Resolution
  • Mechanical Engineering
  • Optical Lattices
  • Physics
  • Reflection
  • Security
  • Sound Pressure
  • Students

Fields of Study

  • Engineering
  • Physics

Readers

  • Electronics Engineering
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Directed Energy