Void Detection in Foam With Knit Lines Using THz Pulse Interrogation

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 alterin...

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Bibliographic Details
Main Authors: Banks, H T, Gibson, N L
Format: Report
Language:English
Subjects:
CLAUSIUS MOSSOTTI EQUATIONS
DEFECTS(MATERIALS)
DIELECTRIC CONSTANT
DIELECTRIC PROPERTIES
Elastomers and Rubber
ELECTROMAGNETIC PROBES
EXPANDED PLASTICS
FOAM
INTERROGATION
KNIT LINES
LOW DENSITY
MATHEMATICAL MODELS
MAXWELLS EQUATIONS
Numerical Mathematics
PLANE WAVES
POLYURETHANE FOAM
POLYURETHANE RESINS
REFRACTIVE INDEX
THERMAL INSULATION
VOIDS
WAVE EQUATIONS
WAVE PROPAGATION
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Summary: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.