A Two Dimensional Electronically Focused Imaging System,

Abstract

A two dimensional acoustic imaging device, with electronic focusing and scanning in both directions was constructed. The device is designed to work with 2.25 MHz acoustic waves. It employs M piezoelectric elements in a transmitting transducer, which produce a beam focused and scanned in the y direction. An N element receiving transducer is used to focus and scan in the x direction. This makes it possible to obtain M by N resolvable spots with only M plus N elements, a considerable saving in complexity. The phase reference for the transmitter and receiver are supplied by frequency modulated chirp signals sent along acoustic surface wave delay lines. One of the novel features of this device is the ability to obtain an arbitrary scan velocity, even a stationary focus, with the transmitter.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1974
Accession Number
ADA070356

Entities

People

  • Gordon S. Kino
  • Herbert John Shaw
  • J. Havlice
  • John J. Fraser
  • W. Leung

Organizations

  • Stanford University

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Frequencies
  • Acoustic Images
  • Acoustic Waves
  • Amplifiers
  • Delay Lines
  • Frequency
  • Images
  • Oscillators
  • Phase Shift
  • Piezoelectric Transducers
  • Radio Frequency Amplifiers
  • Surface Waves
  • Transducers
  • Transistor Amplifiers
  • Transmitters
  • Two Dimensional
  • Waves

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Radar Systems Engineering.
  • Systems Analysis and Design

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems