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

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.
Authors:
 [1] ;  [1]
  1. (Ames, IA)
Publication Date:
OSTI Identifier:
869307
Report Number(s):
US 5313405
US patent application 07/754,904
DOE Contract Number:
W-7405-ENG-82
Resource Type:
Patent
Research Org:
Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
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/