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Title: System and method for non-destructive evaluation of surface characteristics of a magnetic material

Abstract

A system and a related method for non-destructive evaluation of the surface characteristics of a magnetic material. The sample is excited by an alternating magnetic field. The field frequency, amplitude and offset are controlled according to a predetermined protocol. The Barkhausen response of the sample is detected for the various fields and offsets and is analyzed. The system produces information relating to the frequency content, the amplitude content, the average or RMS energy content, as well as count rate information, for each of the Barkhausen responses at each of the excitation levels applied during the protocol. That information provides a contiguous body of data, heretofore unavailable, which can be analyzed to deduce information about the surface characteristics of the material at various depths below the surface.

Inventors:
 [1];  [1]
  1. Ames, IA
Issue Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
OSTI Identifier:
869307
Patent Number(s):
5313405
Application Number:
07/754,904
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; non-destructive; evaluation; surface; characteristics; magnetic; material; related; sample; excited; alternating; field; frequency; amplitude; offset; controlled; according; predetermined; protocol; barkhausen; response; detected; various; fields; offsets; analyzed; produces; information; relating; content; average; rms; energy; count; rate; responses; excitation; levels; applied; provides; contiguous; data; heretofore; unavailable; deduce; depths; below; related method; magnetic field; alternating magnetic; magnetic material; frequency content; count rate; surface characteristics; non-destructive evaluation; energy content; rate information; various depths; controlled according; /702/324/

Citation Formats

Jiles, David C, and Sipahi, Levent B. System and method for non-destructive evaluation of surface characteristics of a magnetic material. United States: N. p., 1994. Web.
Jiles, David C, & Sipahi, Levent B. System and method for non-destructive evaluation of surface characteristics of a magnetic material. United States.
Jiles, David C, and Sipahi, Levent B. Sat . "System and method for non-destructive evaluation of surface characteristics of a magnetic material". United States. https://www.osti.gov/servlets/purl/869307.
@article{osti_869307,
title = {System and method for non-destructive evaluation of surface characteristics of a magnetic material},
author = {Jiles, David C and Sipahi, Levent B},
abstractNote = {A system and a related method for non-destructive evaluation of the surface characteristics of a magnetic material. The sample is excited by an alternating magnetic field. The field frequency, amplitude and offset are controlled according to a predetermined protocol. The Barkhausen response of the sample is detected for the various fields and offsets and is analyzed. The system produces information relating to the frequency content, the amplitude content, the average or RMS energy content, as well as count rate information, for each of the Barkhausen responses at each of the excitation levels applied during the protocol. That information provides a contiguous body of data, heretofore unavailable, which can be analyzed to deduce information about the surface characteristics of the material at various depths below the surface.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1994},
month = {Sat Jan 01 00:00:00 EST 1994}
}

Works referenced in this record:

Theory of ferromagnetic hysteresis (invited)
journal, March 1984


Theory of ferromagnetic hysteresis
journal, September 1986


Theory of ferromagnetic hysteresis: evaluation of stress from hysteresis curves
journal, January 1988


Variation of the magnetic properties of AISI 4140 steels with plastic strain
journal, July 1988


Theory of the magnetisation process in ferromagnets and its application to the magnetomechanical effect
journal, June 1984