Electromagnetic Material Interrogation Using Conductive Interfaces and Acoustic Wavefronts

Banks, H. T.; Buksas, M. W.; Lin, T.

doi:10.1137/1.9780898719871

Cited by 59 publications

(102 citation statements)

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“…Other potential applications for such interrogation techniques are nondestructive damage detection in aircraft and spacecraft where very high frequency electromagnetic pulses can be used to detect the location and width of cracks that may be present [BGW03]. Additional applications are found in mine, ordnance and camouflage surveillance, and subsurface and atmospheric environmental modelling [BBL00].…”

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confidence: 99%

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A computational and statistical framework for multidimensional domain acoustooptic material interrogation

Banks

Bokil

2005

Quart. Appl. Math.

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Abstract. We consider an electromagnetic interrogation technique in two and three dimensions for identifying the dielectric parameters (including the permittivity, the conductivity and the relaxation time) of a Debye medium. In this technique, a travelling acoustic pressure wave in the Debye medium is used as a virtual reflector for an interrogating microwave electromagnetic pulse that is generated in free space. The reflections of the microwave pulse from the air-Debye interface and from the acoustic pressure wave are recorded at a remote antenna. The data is used in an inverse problem to estimate the locally pressure dependent dielectric parameters of the Debye medium. We present a time domain formulation that is solved using finite differences (FDTD) in time and in space. Perfectly matched layer (PML) absorbing boundary conditions are used to absorb outgoing waves at the finite boundaries of the computational domain, preventing spurious reflections from reentering the domain.Using the method of least squares for the parameter identification problem, we compare two different algorithms (the gradient based Levenberg-Marquardt method and the gradient free, simplex based Nelder-Mead method) in solving an inverse problem to calculate estimates for two or more dielectric parameters. Finally we use statistical error analysis to construct confidence intervals for all the presented estimates, thereby providing a probabilistic statement about the computational procedure with uncertainty aspects of estimates.

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confidence: 99%

“…The work in this paper is based on ideas underlying the techniques formulated in [BBL00] and [ABR02]. In [BBL00], the authors present an electromagnetic interrogation technique for general dispersive media backed by either a perfect conducting wall to reflect the electromagnetic waves, or by using standing acoustic waves as virtual reflectors.…”

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A computational and statistical framework for multidimensional domain acoustooptic material interrogation

Banks

Bokil

2005

Quart. Appl. Math.

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“…The constitutive law in (8) is sufficiently general to include models based on differential equations and systems of differential equations or delay differential equations whose solutions can be expressed through fundamental solutions (in general variation-of-parameters representations)-see [2] for details. A number of known polarization laws can be readily treated.…”

Section: Models For Polarizationmentioning

confidence: 99%

“…One can then turn to combinations of Debye, Lorentz, or even more general nth order mechanisms as well as Cole-Cole type (fractional order derivatives) models. We again refer the reader to [2,10] for details.…”

Section: Models For Polarizationmentioning

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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“…The objective of the interrogator is to detect and identify the location and shape of the conducting object based on the scattered field from an interrogation incident field, i.e., the solution of an inverse scattering problems [2,6]. In the plane wave case the incident electromagnetic (EM) field has the form ( E (i) , H .…”

Section: Introductionmentioning

confidence: 99%

Material Surface Design to Counter Electromagnetic Interrogation of Targets

Banks¹,

Ito²,

Kepler³

et al. 2004

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Utilization of controllable ferroelectric and ferromagnetic layers coating a conducting object to provide an attenuation capability against electromagnetic interrogation is discussed. The problem is formulated as a differential game and/or a robust optimization. The scattered field due to interrogation can be attenuated with the assumption of an uncertainty in the interrogation wave numbers. The controllable layer composed of ferromagnetic and ferroelectric materials [9, 10] is incorporated in a mathematical formulation based on the time-harmonic Maxwell equation. Fresnel's law for the reflectance index is extended to the electromagnetic propagation in anisotropic composite layers of ferromagnetic and electronic devices and used to demonstrate feasibility of control of reflections. Our methodology is also tested for a non-planar geometry of the conducting object (an NACA airfoil) in which we report our findings in the form of reduced radar cross sections (RCS).

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Electromagnetic Material Interrogation Using Conductive Interfaces and Acoustic Wavefronts

Cited by 59 publications

References 0 publications

A computational and statistical framework for multidimensional domain acoustooptic material interrogation

A computational and statistical framework for multidimensional domain acoustooptic material interrogation

Homogenization of Periodically Varying Coefficients in Electromagnetic Materials

Material Surface Design to Counter Electromagnetic Interrogation of Targets

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