Accession Number : ADD008160

Title :   Apparatus and Process for Determining the Composition of Fluid-Filled Cavities.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Gaunaurd,Guillermo C ; Uberall,Herbert M

Report Date : 10 Feb 1981

Pagination or Media Count : 10

Abstract : An apparatus and method for determining the material properties characterizing a fluid contained in a cavity inside a solid comprises analyzing the resonances in the amplitude of elastic waves scattered by the cavity. Specifically, the resonance positions and their widths are used to determine the sound speed and the density of the cavity filler. The sound speed is found from the spacing between two consecutive overtones of any mode, which asymptotically becomes uniform for the higher-index overtones. The density is obtained from the width of any high order resonance and accordingly, all the information about the material composition of the filler is contained, and can be extracted, from the high-frequency asymptotic region. (Author)

Descriptors :   *Patents, *Ultrasonic tests, *Nondestructive testing, *Composition(Property), Test equipment, Cavities, Filling, acoustic velocity, Materials, Inventions, High frequency, Scanning, Asymptotic normality

Subject Categories : Test Facilities, Equipment and Methods
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE