Gap detection with electromagnetic terahertz signals

Banks, Harvey Thomas; Gibson, Nathan L.; Winfree, William P.

doi:10.1016/j.nonrwa.2004.09.004

Cited by 12 publications

(14 citation statements)

References 7 publications

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“…In particular, if the distribution F were discrete, consisting of a single relaxation parameter, then we would again have (13). The macroscopic electric polarization becomes…”

Section: The 1-d Problem Formulationmentioning

confidence: 99%

Electromagnetic Inverse Problems Involving Distributions of Dielectric Mechanisms and Parameters

Banks¹,

Gibson²

2005

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We consider electromagnetic interrogation problems for complex materials involving distributions of polarization mechanisms and also distributions for the parameters in these mechanisms. A theoretical and computational framework for such problems is given. Computational results for specific problems with multiple Debye mechanisms are given in the case of discrete, uniform, log-normal, and log-Bi-Gaussian distributions.Keywords: Electromagnetic interrogation with pulsed antenna source microwaves and inverse problems, complex dielectric materials, distributions of relaxation parameters and mechanisms.

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“…In particular, if the distribution F were discrete, consisting of a single relaxation parameter, then we would again have (13). The macroscopic electric polarization becomes…”

Section: The 1-d Problem Formulationmentioning

confidence: 99%

Electromagnetic Inverse Problems Involving Distributions of Dielectric Mechanisms and Parameters

Banks¹,

Gibson²

2005

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“…Our efforts here are motivated by use of electromagnetic interrogating signals (possibly in the Terahertz range) for detection of defects [4,14] in the insulating foam on the fuel tanks of the NASA space shuttles. Defects in the foam are believed to contribute to the problem of separation of the foam during liftoff, resulting in significant damage to and possibly subsequent destruction of the space vehicle itself.…”

Section: Introductionmentioning

confidence: 99%

Homogenization of Periodically Varying Coefficients in Electromagnetic Materials

et al. 2006

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In this paper we employ the periodic unfolding method for simulating the electromagnetic field in a composite material exhibiting heterogeneous microstructures which are described by spatially periodic parameters. We consider cell problems to calculate the effective parameters for a Debye dielectric medium in the cases of circular and square microstructures in two dimensions. We assume that the composite materials are quasi-static in nature, i.e., the wavelength of the electromagnetic field is much larger than the relevant dimensions of the microstructure. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited SUPPLEMENTARY NOTESThe original document contains color images. ABSTRACTIn this paper we employ the periodic unfolding method for simulating the electromagnetic eld in a composite material exhibiting heterogeneous microstructures which are described by spatially periodic parameters. We consider cell problems to calculate the e ective parameters for a Debye dielectric medium in the cases of circular and square microstructures in two dimensions. We assume that the composite materials are quasi-static in nature, i.e., the wavelength of the electromagnetic eld is much larger than the relevant dimensions of the microstructure.

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“…Previous efforts ( [5,6]) investigated the application of polarization mechanisms to account for the attenuation of wave propagation in foam, but matching the simulations to experimental data has yet to be completely successful. While these models were expressed in only one spatial dimension, the 2D formulation in [3] allowed for non-normally incident angles and curved interfaces.…”

Section: Introductionmentioning

confidence: 99%

Pulsed THZ Interrogation of Sofi With Knit Lines in 2D

Banks¹,

Gibson²,

Winfree³

2006

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ABSTRACT. This paper examines the scattering effect of knit lines and voids in SOFI through simulations of THz interrogation at normal and non-normal angles of incidence and using focused and non-focused single-cycle plane waves. We model the electromagnetic field using the TE mode of the 2D Maxwell's equations reduced to a wave equation, which are then solved with a finite-element time-domain method. The knit lines are modeled by changing the dielectric constant.

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Gap detection with electromagnetic terahertz signals

Cited by 12 publications

References 7 publications

Electromagnetic Inverse Problems Involving Distributions of Dielectric Mechanisms and Parameters

Electromagnetic Inverse Problems Involving Distributions of Dielectric Mechanisms and Parameters

Homogenization of Periodically Varying Coefficients in Electromagnetic Materials

Pulsed THZ Interrogation of Sofi With Knit Lines in 2D

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