Electromagnetic Crack Detection Inverse Problems Using Terahertz Interrogating Signals

Abstract

We apply an inverse problem formulation to determine characteristics of a defect from a perturbed electromagnetic interrogating signal. A defect (crack) inside of a dielectric material causes a disruption, from reflections and refractions off of the interfaces, of the windowed interrogating signal. We model the electromagnetic waves inside the material with Maxwell's equations. Using simulations as forward solves, our Newton-based, iterative optimization scheme resolves the dimensions and location of the defect. Numerical results are given in tables and plots, standard errors are calculated, and computational issues are addressed.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2003
Accession Number
ADA446719

Entities

People

  • H. Thomas Banks
  • Nathan L. Gibson
  • William P. Winfree

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Algorithms
  • Boundaries
  • Computational Science
  • Computations
  • Detection
  • Dielectrics
  • Electric Fields
  • Electromagnetic Fields
  • Equations
  • Inverse Problems
  • Low Resolution
  • Magnetic Fields
  • Materials
  • Simulations
  • Simulators
  • Travel Time

Fields of Study

  • Physics

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Nanoscale Plasmonic Nanotechnology
  • Plasma Physics / Magnetohydrodynamics