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Nonlinear control of boundary impedance in an acoustic waveguide [PDF]
The Journal of the Acoustical Society of America, 2021 Wavetubes are employed for measurements of acoustic properties in various fluids. The ability to manipulate and control the frequency-dependent boundary impedance of the tube improves the estimation accuracy. Passive solutions, which use composite materials to change the boundary impedance, enable one to realize a finite combination of boundary ...
Vered, Yoav, Bucher, Izhak
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Realization of Impedance Boundary
IEEE Transactions on Antennas and Propagation, 2006Impedance boundary is generally considered as an approximate model for material interfaces. Considering an electromagnetic field in a certain wave-guiding anisotropic material it is shown that a slab of such a material backed by a perfect electric conductor (PEC) plane can be exactly represented by impedance-boundary conditions.
Ismo V. Lindell, Ari H. Sihvola
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The impedance-boundary condition
IEEE Antennas and Propagation Magazine, 1996Part of the material presented in this article has been collected in the framework of a research activity on the history of ray optics. The aim of this project is collect some reprints of the most-significant original papers of the history of ray optics, from the seventeenth century (i.e., from the work by Rene Descartes) up to now.
PELOSI, GIUSEPPE, P. Y.a. Ufimtsev
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Generalized impedance boundary conditions in scattering
Proceedings of the IEEE, 1991The authors present generalized surface impedance conditions that improve medium characterization. One of the most common conditions that is often used to simulate a dielectric coating is the standard impedance boundary condition, and the improved boundary condition discussed can be viewed as a generalization of this, distinguished by the presence of ...
Thomas B. A. Senior, John L. Volakis
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Electrical Impedance Tomography Problem with Inaccurately Known Boundary and Contact Impedances
3rd IEEE International Symposium on Biomedical Imaging: Macro to Nano, 2006., 2006In electrical impedance tomography (EIT) electric currents are injected into a body with unknown electromagnetic properties through a set of contact electrodes at the boundary of the body. The resulting voltages are measured on the same electrodes and the objective is to reconstruct the unknown conductivity function inside the body based on these data.
Ville Kolehmainen +2 more
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Mixed-Impedance Boundary Conditions
IEEE Transactions on Antennas and Propagation, 2011A novel set of isotropic electromagnetic boundary conditions generalizing some of the recently introduced boundary conditions is introduced. For a planar boundary it is required that the boundary appears as an impedance boundary for the TE and TM components of the field with different surface impedances in the general case. Thus, such conditions can be
Lindell, Ismo V +3 more
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Impedance boundary conditions in ultrasonics
IEEE Transactions on Antennas and Propagation, 2000A generalized impedance boundary condition (GIBC) is developed to approximate the scattering of a plane acoustic wave from a bone structure such as a rib. In particular, the rib and surrounding tissue are modeled as a viscoelastic cylinder of infinite length immersed in an infinite, inviscid fluid medium.
J.D. Shumpert, T.B.A. Senior
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Resonances in Impedance-Boundary Spheres
2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), 2018This presentation focuses on the electromagnetic scattering characteristics of spheres with surface defined by the impedance boundary condition. The results include resonances that are very strong and sharp for small subwavelength particles, and analogous to the localized surface plasmons.
Sihvola, A. +5 more
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Generalized impedance boundary condition
2007 IEEE Antennas and Propagation Society International Symposium, 2007In this paper, we propose a rigorous frequency domain surface integral formulation to efficiently model arbitrarily shaped conductors. It includes the skin effect via the lossy Green's function. It can also be extended to the low frequency regime to ensure the necessary wide-band coverage. In the high frequency limit, as skin depth approaches zero, our
Qian, ZG, Chew, WC
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