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Sökning: swepub > (1990-1994) > Kristensson Gerhard > Bokkapitel

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  • Karlsson, Anders, et al. (författare)
  • Transient wave propagation in gyrotropic media
  • 1992
  • Ingår i: Invariant inbedding and inverse problems. - SIAM. - 0-89871-305-6 ; s. 77-89
  • Bokkapitel (övrigt vetenskapligt)abstract
    • In this paper transient electromagnetic wave propagation in an inhomogeneous,<br /> cold plasma is considered. It is assumed that a constant magnetic<br /> induction is present and that the plasma is spatially inhomogeneous in the<br /> direction of the magnetic induction. Losses in the plasma are modeled with a<br /> collision frequency ν. The direct problem, which is to calculate the reflected<br /> and transmitted responses of the plasma, is considered in this paper. Special<br /> attention is paid to the precursor effects in the plasma and several examples<br /> of precursor effects in an inhomogeneous plasma are showed.
  • Karlsson, Anders, et al. (författare)
  • Wave splitting and imbedding equations for a spherically symmetric dispersive medium
  • 1992
  • Ingår i: Invariant inbedding and inverse problems. - SIAM. - 0-89871-305-6 ; s. 103-113
  • Bokkapitel (övrigt vetenskapligt)abstract
    • The direct problem of time dependent electromagnetic scattering in the dispersive<br /> sphere is solved by a wave splitting technique. The electric field is<br /> expanded in a series involving vector spherical harmonics, leading to a system<br /> of wave equations for each term. These systems are reduced to scalar<br /> wave equations for each term, which are solved via reflection operators. Some<br /> preliminary numerical results are presented.
  • Kristensson, Gerhard, et al. (författare)
  • Time domain inversion techniques for electromagnetic scattering problems
  • 1992
  • Ingår i: Invariant imbedding and inverse problems. - SIAM. - 0-89871-305-6 ; s. 1-29
  • Bokkapitel (övrigt vetenskapligt)abstract
    • This paper presents a review of and a comparison between two different methods<br /> to solve an inverse scattering problem in the time domain. The problem<br /> is that of propagation of transient electromagnetic waves in spatially inhomogeneous<br /> slabs of finite length. The permittivity and conductivity profiles<br /> are assumed to vary only with depth and the scattering problem is thus onedimensional.<br /> Several algorithms to solve the direct and inverse scattering<br /> problems for continuous and discontinuous permittivity profiles are suggested.<br /> Some of these algorithms have not been published before. The aim of this paper<br /> is to compare and review these methods. More specifically, the numerical<br /> performance of the invariant imbedding approach (layer-stripping)and the<br /> Green functions formulation (downward continuation)is compared. Some<br /> new results based upon time reversal techniques for a lossless slab are presented<br /> in an appendix.
  • Kristensson, Gerhard, et al. (författare)
  • The inverse scattering problem for a homogeneous bi-isotropic slab using transient data
  • 1993
  • Ingår i: Inverse problems in mathematical physics / Lecture notes in physics. - Springer. - 0075-8450. - 3-540-57195-7 ; 422, s. 112-125
  • Bokkapitel (övrigt vetenskapligt)abstract
    • Transient wave propagation in a finite bi-isotropic slab is treated. The incident<br /> field impinges normally on the slab, which can be inhomogeneous wrt<br /> depth. Dispersion and bi-isotropy are modeled by time convolutions in the<br /> constitutive relations. Outside the slab the medium is assumed to be homogeneous,<br /> non-dispersive and isotropic, and such that there is no phase velocity<br /> mismatch at the boundaries of the slab. Two alternative methods of solution<br /> to the propagation problem are given—the imbedding method and the Green<br /> function approach. The second method is used to solve the inverse problem<br /> and the first to generate synthetic data. The inverse scattering problem is to<br /> reconstruct the four susceptibility kernels of the medium using a set of finite<br /> time trace of reflection and transmission data.
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  • Resultat 1-5 av 5
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Karlsson, Anders (2)
Corones, J. P. (2)
Nelson, P. (2)
Seth, D. L. (2)
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