Advertisement

Inversion of Transient Eddy-Current Signals for the Determination of Conducting Plate Parameters

  • M. J. Johnson
  • J. R. Bowler
Chapter

Abstract

In traditional eddy-current NDE, an electromagnetic field is excited by a coil driven with a time-harmonic current. Information about the test piece is found from the effect of induced current on the coil impedance. Additional information may be obtained by using a number of different frequencies. In contrast, transient eddy-currents are excited by means of a pulsed coil current and perturbations of the magnetic field due to the test piece are monitored by observing the variation of the induced emf across the coil with time. Alternatively, the field perturbations may be detected by sensing the magnetic field using a Hall device.

Keywords

Test Piece Transient Signal Hall Sensor Coil Current Inversion Scheme 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    P. Hammond, Proceedings I.E.E., Monograph No 514S, p508-515, April 1962.Google Scholar
  2. 2.
    C. V. Dodd and W. E. Deeds, Analytical Solutions to Eddy-Current Probe-Coil Problems, J. Appl. Phys. 39 (6), pp2829–2838, 1968.CrossRefGoogle Scholar
  3. 3.
    J. R. Bowler, Measurement and Calculation of Transient Eddy-currents in Layered Structures, Review of Progress in Quantitative Nondestructive Evaluation, Vol 11A (Plenum, New York) pp241–248, 1992.CrossRefGoogle Scholar
  4. 4.
    J. R. Bowler, Prediction and Analysis of Transient Eddy-current Probe Signal, Review of Progress in Quantitative Nondestructive Evaluation, Vol 9A (Plenum, New York) pp287–293, 1990.Google Scholar
  5. 5.
    I. S. Gradshteyn and I. M. Ryzhik, Tables of Integrals, Series and Products, (Academic Press, New York, 1980) 6.612, p709.Google Scholar

Copyright information

© Plenum Press, New York 1995

Authors and Affiliations

  • M. J. Johnson
    • 1
  • J. R. Bowler
    • 1
  1. 1.Department Of PhysicsUniversity Of SurreyGuildford, SurreyUK

Personalised recommendations