Accession Number : ADA294629

Title :   Space-Time Characteristics of the Turbulent Flow Energy in a Viscoelastic Medium Using Noninvasive Passive Imaging.

Descriptive Note : Progress rept.,

Corporate Author : NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI

Personal Author(s) : Owsley, Norman L. ; Ahmed, Mohamed H. ; Hull, Andrew J. ; Kassal, James

PDF Url : ADA294629

Report Date : 06 MAR 1995

Pagination or Media Count : 66

Abstract : This report describes the technology required for noninvasive passive imaging of the turbulent flow energy of space-time signals in a viscoelastic medium. The need for such technology emerges from the field of biomedicine, where low cost noninvasive techniques are necessary to accurately diagnose heart disease. A sensor that can detect extremely low energy levels, such as those encountered in a stenosed artery, is investigated. An experiment that consists of a urethane solid containing a partially blocked embedded surgical tube is described. Measurements of turbulence-induced energy levels are included in both the spatial-frequency domain and the wavenumber-frequency domain. Modeling of continuous sources using two different beamformers is addressed. Also presented are recommendations for future studies.

Descriptors :   *VISCOELASTICITY, *TURBULENT FLOW, *ENERGY LEVELS, SOURCES, MODELS, LOW COSTS, ENERGY, PASSIVE SYSTEMS, TURBULENCE, SOLIDS, LOW ENERGY, IMAGES, BEAM FORMING, LOW LEVEL, HEART, BIOMEDICINE, URETHANES, CARDIOVASCULAR DISEASES.

Subject Categories : Mechanics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE