Accession Number : AD0754805

Title :   Measurement of Small Changes in Sound Velocity in the UHF Range,

Corporate Author : CORNELL UNIV ITHACA N Y MATERIALS SCIENCE CENTER

Personal Author(s) : Dooley,John W.

Report Date : 12 AUG 1969

Pagination or Media Count : 16

Abstract : Several modifications of a pulse-echo technique for measurements of small changes in ultrasonic phase velocities are described. They are of varying complexity and precision. The best methods are accurate to 2 ppm at 500 MHz; one of these is automatic and has a response time of the order of 1 second. The methods are applicable a s long as the waveform of one echo can be distinguished from noise. (Author)

Descriptors :   (*ULTRASONIC RADIATION, ATTENUATION), ULTRAHIGH FREQUENCY, PULSE ANALYZERS, TEST EQUIPMENT, TEST METHODS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE