Advanced Signal Analysis and Instrumentation for Barkhausen Stress Measurement in Steels

Abstract

Advanced methods of signal analysis were investigated as a means of improving instrumentation for Barkhausen noise stress measurement. Methods employed included pulse-sorting and pulse-counting, correlation and probability measurements, and spectrum analysis. Specimens of AISI 4340 steel and AISI 4130 steel were studied. It was found that the Barkhausen noise auto-correlation function, amplitude probability distribution, and amplitude probability density correspond closely to the comparable functions obtained from random noise. These statistical functions were found to be independent of magnetization rate and probe liftoff but slightly dependent on stress. Cursory experiments indicated that reducing the detector bandwidth may provide a means of increasing the stress sensitivity of these parameters.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1977
Accession Number
ADA045826

Entities

People

  • G. A. Matzkanin
  • G. L. Burkhardt

Organizations

  • Southwest Research Institute

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Analyzers
  • Correlation Techniques
  • Detection
  • Detectors
  • Distribution Functions
  • Ferromagnetic Materials
  • Hall Effect
  • Magnetic Detectors
  • Magnetic Fields
  • Materials Testing
  • Mechanics
  • Nondestructive Testing
  • Probability Distributions
  • Pulse Amplitude
  • Pulse Height Analyzers
  • Test And Evaluation

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Statistical inference.