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Title: Method and apparatus for correcting eddy current signal voltage for temperature effects

Abstract

An apparatus and method for measuring physical characteristics of an electrically conductive material by the use of eddy-current techniques and compensating measurement errors caused by changes in temperature includes a switching arrangement connected between primary and reference coils of an eddy-current probe which allows the probe to be selectively connected between an eddy current output oscilloscope and a digital ohm-meter for measuring the resistances of the primary and reference coils substantially at the time of eddy current measurement. In this way, changes in resistance due to temperature effects can be completely taken into account in determining the true error in the eddy current measurement. The true error can consequently be converted into an equivalent eddy current measurement correction.

Inventors:
 [1];  [2]
  1. (N. Huntingdon, PA)
  2. (Pittsburgh, PA)
Issue Date:
Research Org.:
WESTINGHOUSE ELECTRIC CORP
OSTI Identifier:
867240
Patent Number(s):
4893079
Assignee:
United States of America as represented by United States (Washington, DC) BAPL
DOE Contract Number:  
AC11-76PN00014
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; correcting; eddy; current; signal; voltage; temperature; effects; measuring; physical; characteristics; electrically; conductive; material; eddy-current; techniques; compensating; measurement; errors; caused; changes; switching; arrangement; connected; primary; reference; coils; probe; allows; selectively; output; oscilloscope; digital; ohm-meter; resistances; substantially; time; resistance; due; completely; account; determining; true; error; consequently; converted; equivalent; correction; signal voltage; current measurement; physical characteristics; eddy current; conductive material; electrically conductive; current signal; current probe; selectively connected; temperature effects; measuring physical; current output; errors caused; selectively connect; physical characteristic; correcting eddy; /324/

Citation Formats

Kustra, Thomas A., and Caffarel, Alfred J. Method and apparatus for correcting eddy current signal voltage for temperature effects. United States: N. p., 1990. Web.
Kustra, Thomas A., & Caffarel, Alfred J. Method and apparatus for correcting eddy current signal voltage for temperature effects. United States.
Kustra, Thomas A., and Caffarel, Alfred J. Mon . "Method and apparatus for correcting eddy current signal voltage for temperature effects". United States. https://www.osti.gov/servlets/purl/867240.
@article{osti_867240,
title = {Method and apparatus for correcting eddy current signal voltage for temperature effects},
author = {Kustra, Thomas A. and Caffarel, Alfred J.},
abstractNote = {An apparatus and method for measuring physical characteristics of an electrically conductive material by the use of eddy-current techniques and compensating measurement errors caused by changes in temperature includes a switching arrangement connected between primary and reference coils of an eddy-current probe which allows the probe to be selectively connected between an eddy current output oscilloscope and a digital ohm-meter for measuring the resistances of the primary and reference coils substantially at the time of eddy current measurement. In this way, changes in resistance due to temperature effects can be completely taken into account in determining the true error in the eddy current measurement. The true error can consequently be converted into an equivalent eddy current measurement correction.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

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