Accession Number : AD0643081

Title :   IMPROVEMENT IN ULTRASONIC VELOCITY MEASUREMENT TECHNIQUES.

Descriptive Note : Final technical rept.,

Corporate Author : BROWN UNIV PROVIDENCE R I DIV OF APPLIED MATHEMATICS

Personal Author(s) : Chick,Bruce B. ; Anderson,George P. ; Truell,Rohn

Report Date : OCT 1966

Pagination or Media Count : 18

Abstract : A 'brute force' time interval measurement system capable of resolving changes in time interval of <10 picoseconds (<10 to the minus 11th power sec) has been developed to the point where preliminary measurements are possible with the uncalibrated 'breadboard' system. Good triggering stability and resolution have been obtained but some drift is evident in early performance of the system which does not as yet have temperature control of known temperature sensitive elements. As a preliminary test, the system has been used to measure the small changes in velocity produced by the application of a magnetic field to an aluminum single crystal at room temperatures. (Author)

Descriptors :   (*ULTRASONIC RADIATION, MEASUREMENT), VELOCITY, SOLIDS

Subject Categories : Test Facilities, Equipment and Methods
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE