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Title: Method and apparatus for measurement of orientation in an anisotropic medium

Abstract

A method and apparatus are provided for simultaneously measuring the anisotropic orientation and the thickness of an article. The apparatus comprises a transducer assembly which propagates longitudinal and transverse waves through the article and which receives reflections of the waves. A processor is provided to measure respective transit times of the longitudinal and shear waves propagated through the article and to calculate respective predicted transit times of the longitudinal and shear waves based on an estimated thickness, an estimated anisotropic orientation, and an elasticity of the article. The processor adjusts the estimated thickness and the estimated anisotropic orientation to reduce the difference between the measured transit times and the respective predicted transit times of the longitudinal and shear waves.

Inventors:
 [1];  [2];  [3]
  1. Burnt Hills, NY
  2. Norman, OK
  3. (Niskayuna, NY)
Issue Date:
Research Org.:
General Electric Co., Schenectady, NY (United States)
OSTI Identifier:
872528
Patent Number(s):
5955671
Assignee:
General Electric Company (Schenectady, NY)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
FC21-95MC31176
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; measurement; orientation; anisotropic; medium; provided; simultaneously; measuring; thickness; article; comprises; transducer; assembly; propagates; longitudinal; transverse; waves; receives; reflections; processor; measure; respective; transit; times; shear; propagated; calculate; predicted; based; estimated; elasticity; adjusts; reduce; difference; measured; simultaneously measuring; transverse waves; shear waves; transit time; shear wave; apparatus comprises; transducer assembly; transit times; apparatus comprise; waves propagated; /73/

Citation Formats

Gilmore, Robert Snee, Kline, Ronald Alan, and Deaton, Jr., John Broddus. Method and apparatus for measurement of orientation in an anisotropic medium. United States: N. p., 1999. Web.
Gilmore, Robert Snee, Kline, Ronald Alan, & Deaton, Jr., John Broddus. Method and apparatus for measurement of orientation in an anisotropic medium. United States.
Gilmore, Robert Snee, Kline, Ronald Alan, and Deaton, Jr., John Broddus. Fri . "Method and apparatus for measurement of orientation in an anisotropic medium". United States. https://www.osti.gov/servlets/purl/872528.
@article{osti_872528,
title = {Method and apparatus for measurement of orientation in an anisotropic medium},
author = {Gilmore, Robert Snee and Kline, Ronald Alan and Deaton, Jr., John Broddus},
abstractNote = {A method and apparatus are provided for simultaneously measuring the anisotropic orientation and the thickness of an article. The apparatus comprises a transducer assembly which propagates longitudinal and transverse waves through the article and which receives reflections of the waves. A processor is provided to measure respective transit times of the longitudinal and shear waves propagated through the article and to calculate respective predicted transit times of the longitudinal and shear waves based on an estimated thickness, an estimated anisotropic orientation, and an elasticity of the article. The processor adjusts the estimated thickness and the estimated anisotropic orientation to reduce the difference between the measured transit times and the respective predicted transit times of the longitudinal and shear waves.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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Works referenced in this record:

Ultrasonic Orientation Determination of Single Crystals
journal, January 1967


Texture of polycrystalline metals characterized by ultrasonic velocity measurements
journal, May 1987


A method for the solution of certain non-linear problems in least squares
journal, January 1944


Industrial ultrasonic imaging and microscopy
journal, June 1996


Relations between elastic constants C i j and texture parameters for hexagonal materials
journal, March 1990


Ultrasonic Double Refraction in Worked Metals
journal, November 1961


Simultaneous measurement of the acoustical properties of a thin‐layered medium: The inverse problem
journal, June 1994


An Algorithm for Least-Squares Estimation of Nonlinear Parameters
journal, June 1963