Surface Impedance Modification of Plates in a Water-Filled Waveguide

Abstract

The interaction of parallel waves, propagating in a water-filled cylindrical wave-guide, with a plate perpendicular to its axis is determined by the plate's specific acoustic impedance, the product of density and wave speed. By means of an attached piezoelectric disk-shaped double transducer, (sensor and actuator), the apparent surface impedance of the plate is modified to equal the impedance of the medium, thus establishing a no-reflection situation. The actuator voltage is regulated by a feedback loop, based on an algorithm for complex-root finding.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1992
Accession Number
ADA255227

Entities

People

  • Pieter S. Dubbelday

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors

DTIC Thesaurus Topics

  • Abstracts
  • Acoustic Impedance
  • Actuators
  • Algorithms
  • Computer Programming
  • Current Density
  • Feedback
  • Impedance
  • Materials
  • Measurement
  • Military Research
  • Reflection
  • Transducers
  • Waveguides
  • Waves

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering