Acoustic and electromagnetic wave interaction: analytical formulation for acousto-electromagnetic scattering behavior of a dielectric cylinder

Lawrence, D.E.; Sarabandi, Kamal

doi:10.1109/8.954927

Cited by 29 publications

(19 citation statements)

References 12 publications

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“…Initially the Integral Equation formulation applied to a single 2D rod was tested against the analytical Mie series solution [9] at 3THz. The sphere surface currents were computed using both techniques and it can be seen in Figure 2 that good agreement between the currents is achieved.…”

Section: Resultsmentioning

confidence: 99%

Design of 2D TeraHertz band-gap photonic waveguides using an accelerated integral equation technique

Bogusevschi

Degirmenci

Brennan

et al. 2009

2009 International Conference on Electromagnetics in Advanced Applications

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-This paper describes the application of the Buffered Block Forward Backward (BBFB) method to the problem of modeling 2D TeraHertz (THz) photonic band gap waveguides at the frequency of 3THz. The Method of Moments (MoM) is applied to the Integral Equation (IE) formulation in order to obtain the linear system that is solved using the BBFB technique. The waveguide dimensions are obtained using the gap map technique.

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Section: Resultsmentioning

confidence: 99%

Design of 2D TeraHertz band-gap photonic waveguides using an accelerated integral equation technique

Bogusevschi

Degirmenci

Brennan

et al. 2009

2009 International Conference on Electromagnetics in Advanced Applications

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“…Results of this derived work have already been published in [14], and the interested reader is referred there.…”

Section: Introductionmentioning

confidence: 82%

Acoustic and electromagnetic wave interaction: Estimation of doppler spectrum from an acoustically vibrated metallic circular cylinder

Sarabandi

Lawrence

2003

IEEE Trans. Antennas Propagat.

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Abstract-The idea of using acoustically induced Doppler spectra as a means for target detection and identification is introduced. An analytical solution for the calculation of the bistatic scattered Doppler spectrum from an acoustically excited, vibrating metallic circular cylinder is presented. First the electromagnetic scattering solution of a slightly deformed circular cylinder is obtained using a perturbation method. Then, assuming the vibration frequency is much smaller than the frequency of the incident electromagnetic wave, a closed form expression for the time-frequency response of the bistatic scattered field is obtained which can be used directly for estimating the Doppler spectrum. The acoustic scattering solution for an incident acoustic plane wave upon a solid elastic cylinder is applied to give the displacement of the cylinder surface as a function of time. Results indicate that the scattered Doppler frequencies correspond to the mechanical vibration frequencies of the cylinder, and the sidelobe Doppler spectrum level is, to the first order, linearly proportional to the degree of deformation and is a function of bistatic angle. Moreover, the deformation in the cylinder, and thus the Doppler sidelobe level, only becomes sizeable near frequencies of normal modes of free vibration in the cylinder. Utilizing the information in the scattered Doppler spectrum could provide an effective means of buried object identification, where acoustic waves are used to excite the mechanical resonances of a buried object.

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“…This mode dependence suggests that a higher order boundary condition should be used in place of (3). If we revise the general, second order GIBC found in [1], [15] to account for fields interior to the scatterer, we can replace the SBC of (3) with (13) where denotes differentiation tangent to the surface. The increased accuracy of this boundary condition comes from the inclusion of higher order derivatives of the fields.…”

Section: A Tm Casementioning

confidence: 99%

“…None of these studies, however, consider arbitrary vibrations of the surface. More recently, an analytical study of EM scattering from metallic and dielectric circular cylinders with arbitrary vibration has been presented using a perturbation technique [12], [13], but the technique cannot be applied to objects of arbitrary cross-section. What is needed now is an efficient numerical method to calculate the EM scattering from a vibrating, penetrable object having arbitrary cross-section and arbitrary vibration.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic scattering from vibrating penetrable objects using a general class of time-varying sheet boundary conditions

Lawrence

Sarabandi

2006

IEEE Trans. Antennas Propagat.

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Abstract-Calculation of electromagnetic (EM) scattering from vibrating penetrable cylinders of arbitrary cross-section is presented using a general class of time-varying sheet boundary conditions (SBCs) in conjunction with the method of moments (MoM). Sheet impedance and admittance expressions are first derived from the exact scattering solution for a penetrable circular cylinder with perturbed radius. Then, using the SBCs, integral equations are derived and solved numerically so that vibrating cylinders with arbitrary cross-section can be treated. Cylinder vibrations are assumed to be non-relativistic, allowing a simplified calculation of the scattered Doppler spectrum. A critical factor in the calculation of the potentially small Doppler components is that the time-varying nature of the cylinder boundary, contained within the sheet impedance and admittance expressions, can be isolated from the unperturbed terms in the scattered field. Comparison with exact and analytical perturbation solutions are presented to demonstrate the accuracy of the numerical solution.Index Terms-Doppler spectrum, electromagnetic scattering, impedance boundary conditions, method of moments (MoM), RCS, sheet boundary conditions.

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Acoustic and electromagnetic wave interaction: analytical formulation for acousto-electromagnetic scattering behavior of a dielectric cylinder

Cited by 29 publications

References 12 publications

Design of 2D TeraHertz band-gap photonic waveguides using an accelerated integral equation technique

Design of 2D TeraHertz band-gap photonic waveguides using an accelerated integral equation technique

Acoustic and electromagnetic wave interaction: Estimation of doppler spectrum from an acoustically vibrated metallic circular cylinder

Electromagnetic scattering from vibrating penetrable objects using a general class of time-varying sheet boundary conditions

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