Accession Number : AD0286643

Title :   DETERMINATION OF THE GEOMETRY OF HIDDEN DEFECTS BY ULTRASONIC PULSE ANALYSIS TESTING

Corporate Author : ARMY RESEARCH OFFICE WASHINGTON D C

Personal Author(s) : GERICKE,O.R.

Report Date : DEC 1962

Pagination or Media Count : 1

Abstract : Paper presented at the 1962 Army Science Conference, 20-22 June 1962, at the United States Military Academy, West Point, New York. DESCRIPTORS: *Ultrasonics, *Ultrasonic spec trum analysis, *Metals, *Pulse analyzers, S OLIDS, Frequency, Tests. Current methods for ultrasonic inspection of metals and other solid materials are limited by their inability to determine the geometry of concealed defects if these defects are comparable i size, or smaller than the width of the ultrasonic search beam. Whenever such relatively small flaws are involved, ultrasonic pulse echo testing, if conducted at a single fre ency, will yield the flaw location only but no i formation on th fl w geometry. Hence, it is very difficult to interpret the test results. The difficulty can be overco e by introducing the novel ultrasonic test method described in this paper. In his method, ultrasonic signals are utilized which contain a broad band of frequencies, and in analogy to optics, can therefore be considered as white ult asonic pulses. The form and spectral s information on the defect configuration. The successful application of the ultra onic pulse analysis method for differenti ing between fl ws of variou configurations is illustrated by a number of test examples. (Author)

Descriptors :   *METALS, *PULSE ANALYZERS, *SPECTRUM ANALYZERS, *ULTRASONIC RADIATION, FREQUENCY, SOLIDS, TESTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE