Sammanfattning
The focus of this thesis is on the use of wave splitting in electromagnetic direct and inverse scattering problems. Wave splitting offers a decomposition of wave fields into appropriate input and output wave constituents. Several different wave splittings are studied including onedimensional, multidimensional energyflux, and multidimensional locally exact wave splittings. The Bremmer series is naturally connected to wave splitting as a method to decompose a complex scattering problem into a sequence of single scattering problems. The onedimensional Bremmer series is reviewed and timedomain convergence is shown for the acoustic locally exact wave splitting. The emphasis of the inverse scattering problems is on the identification of the spatial structure of complex medium models in multidimensions from timedomain data. The parameter identification is determined in an iterative fashion with a conjugategradient algorithm where the leastsquares error of the output field is minimized. The gradient is determined from the solution of an additional adjoint problem. The energyflux split fields are shown to give a good representation of the boundary fields in the inverse scattering problem. Several multiparameter identifications are performed in two spatial dimensions.
A detailed analysis is included about electromagnetic modeling. The nonuniqueness of the instantaneous response and the longtime behavior is specially emphasized.
Finally, timereversal mirrors and timereversal cavities are discussed.
A detailed analysis is included about electromagnetic modeling. The nonuniqueness of the instantaneous response and the longtime behavior is specially emphasized.
Finally, timereversal mirrors and timereversal cavities are discussed.
Originalspråk  engelska 

Kvalifikation  Doktor 
Tilldelande institution 

Handledare 

Tilldelningsdatum  2000 juni 7 
Förlag  
ISBN (tryckt)  9178740681 
Status  Published  2000 
Bibliografisk information
Defence detailsDate: 20000607
Time: 10:15
Place: E:1406 House of Electrical Engineering LTH
External reviewer(s)
Name: Langenberg, KarlJörg
Title: Prof.
Affiliation: Dept. of Electrical Engineering, University of Kassel

Ämnesklassifikation (UKÄ)
 Elektroteknik och elektronik