Accession Number : AD0754811

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

Corporate Author : CORNELL UNIV ITHACA N Y MATERIALS SCIENCE CENTER

Personal Author(s) : Edgerton,Robert F.

Report Date : 12 AUG 1969

Pagination or Media Count : 13

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)

Descriptors :   (*NONDESTRUCTIVE TESTING, ULTRASONIC RADIATION), (*PIEZOELECTRIC CRYSTALS, ACOUSTIC PROPERTIES), POTASSIUM COMPOUNDS, CHLORIDES, DOPING, LITHIUM, CYANIDES, ATTENUATION, TEST METHODS, TEST EQUIPMENT

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE