A Simple Measurement Technique for Small Relative Velocity Changes of GHz Acoustic Waves,

Abstract

A simple method for measuring small relative acoustic velocity changes of GHz acoustic waves over a temperature range from 1.7 to 50K has been developed. It has been possible to extend the conventional pulse-echo method to the gigahertz frequency range by displaying the intermediate frequency (60 MHz) on an oscilloscope and recording the changes in the phase of the IF associated with a chosen echo as a function of temperature. A precision of about 10 ppm can be achieved. Results on KCl:Li(+) and KCl:CN(-) illustrate the usefulness of the technique. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 12, 1969
Accession Number
AD0754811

Entities

People

  • Robert F. Edgerton

Organizations

  • Cornell University

Tags

DTIC Thesaurus Topics

  • Acoustic Velocity
  • Acoustic Waves
  • Frequency
  • Frequency Shift
  • Intermediate Frequencies
  • Measurement
  • Motion
  • Oscilloscopes
  • Physical Properties
  • Precision
  • Waves

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Control Systems Engineering.
  • Structural Health Monitoring of Composite Structures.