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:
-
- N. Huntingdon, PA
- Pittsburgh, PA
- Issue Date:
- Research Org.:
- Westinghouse Electric Corp., Pittsburgh, PA (United States)
- OSTI Identifier:
- 867240
- Patent Number(s):
- 4893079
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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}
}