Void Detection in Foam With Knit Lines Using THz Pulse Interrogation

Abstract

We model electromagnetic interrogation of a polyurethane foam using the TE mode of the 2D Maxwell's equations reduced to the wave equation for a fixed frequency in the THz regime. The foam block target contains knit lines which are modeled by modifying the speed of propagation, i.e., by altering the index of refraction. We describe our efforts to estimate the dielectric constant in the knit lines, as well as in the surrounding foam, by use of the classical Clausius-Mossotti equation, assuming only a change in density. We compare the numerical simulations accounting for knit lines to those in which knit lines are neglected, each in the context of modeling reflections of plane waves in foam with voids.

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Document Details

Document Type
Technical Report
Publication Date
Feb 04, 2006
Accession Number
ADA443720

Entities

People

  • H. Thomas Banks
  • N. L. Gibson

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Boundaries
  • Composite Materials
  • Detection
  • Dielectric Permittivity
  • Dielectric Properties
  • Experimental Data
  • Frequency
  • Interrogation
  • Low Density
  • Materials
  • Plane Waves
  • Refraction
  • Refractive Index
  • Signal Processing
  • Two Dimensional

Readers

  • Microwave Engineering.
  • Reinforced Composite Materials
  • Wave Propagation and Nonlinear Chaotic Dynamics.