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

Patent ·
OSTI ID:869307
 [1];  [1]
  1. Ames, IA
+ Show Author Affiliations

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.

Research Organization:
Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
DOE Contract Number:
W-7405-ENG-82
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA)
Patent Number(s):
US 5313405
Application Number:
07/754,904
OSTI ID:
869307
Country of Publication:
United States
Language:
English

References (7)

Variation of the magnetic properties of AISI 4140 steels with plastic strain journal July 1988
Integrated on‐line instrumentation for simultaneous automated measurement of magnetic field, induction, Barkhausen effect, magnetoacoustic emission, and magnetostriction journal April 1988
Theory of ferromagnetic hysteresis: evaluation of stress from hysteresis curves journal January 1988
Theory of the magnetisation process in ferromagnets and its application to the magnetomechanical effect journal June 1984
Theory of ferromagnetic hysteresis (invited) journal March 1984
Theory of ferromagnetic hysteresis journal September 1986
The effect of compressive plastic deformation on the magnetic properties of AISI 4130 steels with various microstructures journal July 1988

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Related Subjects

/702/324/
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