Studies of Quantitative Methods for Imaging from Scattered Fields
Rept. for 30 Nov 1991-15 Apr 1992
LOWELL UNIV MA DEPT OF ELECTRICAL ENGINEERING
Pagination or Media Count:
The analysis of the advantages and disadvantages of the homomorphic filtering technique applied to solve the exact inverse scattering problem has continued. There have been problems with strongly scattering objects due to phase unwrapping. Work has continued to more carefully compare the reconstruction of VPsi from the backpropagation of simulated data with that predicted for the direct problem, from the same data. We note that phase unwrapping is avoided with the differential cepstrum we believe that there might be an interesting connection between this and a novel differential formalism for the Rytov approximation. This report focuses mainly on new developments in modelling scattering from nonlinear media. In anticipation of the next phase of this project, namely to consider the inverse scattering problem for nonlinear media, we have been studying the writing of structures into nonlinear media, specifically photorefractive crystals.
- Quantum Theory and Relativity