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Application of Optimization Methods to Crack Profile Inversion Using Eddy Currents
AIP Conference Proceedings
  • John R. Bowler, Iowa State University
  • Wei Zhang, Iowa State University
  • Aleksandar Dogandžić, Iowa State University
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Conference Proceeding
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A numerical scheme for finding crack shapes from eddy current measurements has been developed based on a startdard iterative inversion approach in which a nonlinear least squares objective function quantifying the overall difference between predictions and measurements is minimized. In this paper, steepest descent and conjugate‐gradient methods for minimizing the objective function are investigated and compared. Cramér‐Rao lower bounds on the crack parameters are derived to quantify the accuracy of the estimated crack shape. Cramér‐Rao bounds are also used to indicate improvements in the design of eddy‐current nondestructive evaluation systems.

The following article appeared in AIP Conference Proceedings 657 (2003): 742 and may be found at doi:10.1063/1.1570210.

Copyright 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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American Institute of Physics
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Citation Information
John R. Bowler, Wei Zhang and Aleksandar Dogandžić. "Application of Optimization Methods to Crack Profile Inversion Using Eddy Currents" AIP Conference Proceedings Vol. 657 (2003) p. 742 - 749
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