skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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 Univ., Ames, IA (United States)
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)

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
Integrated on‐line instrumentation for simultaneous automated measurement of magnetic field, induction, Barkhausen effect, magnetoacoustic emission, and magnetostriction journal April 1988
The effect of compressive plastic deformation on the magnetic properties of AISI 4130 steels with various microstructures journal July 1988

Similar Records

Micromagnetic surface studies of materials for nondestructive evaluation
Thesis/Dissertation · Wed Nov 25 00:00:00 EST 1992 · OSTI ID:869307
Micromagnetic surface studies of materials for nondestructive evaluation
Technical Report · Wed Nov 25 00:00:00 EST 1992 · OSTI ID:869307
Imaging surface conditions of ferromagnetic steel using Barkhausen technique
Conference · Tue Nov 01 00:00:00 EST 1994 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) · OSTI ID:869307

Related Subjects

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/