Phaseless tomographic inverse scattering in Banach spaces

6th International Workshop on New Computational Methods for Inverse Problems

物理学;计算机科学

Estatico, C.^1 ; Fedeli, A.^2 ; Pastorino, M.^2 ; Randazzo, A.^2 ; Tavanti, E.^2

Department of Mathematics, University of Genoa, Via Dodecaneso 35, Genoa

I-16146, Italy^1

Department of Electrical, Electronic Telecommunication Engineering, and Naval Architecture, University of Genoa, Via Opera Pia 11A, Genoa

I-16145^2

关键词: Analytical expressions;    Dielectric objects;    Inexact Newton method;    Integral formulations;    Iterative regularization;    Measurement apparatus;    Non-linear inverse problem;    Scattering wave fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/756/1/012010/pdf
DOI  :  10.1088/1742-6596/756/1/012010

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

In conventional microwave imaging, a hidden dielectric object under test is illuminated by microwave incident waves and the field it scatters is measured in magnitude and phase in order to retrieve the dielectric properties by solving the related non-homogenous Helmholtz equation or its Lippmann-Schwinger integral formulation. Since the measurement of the phase of electromagnetic waves can be still considered expensive in real applications, in this paper only the magnitude of the scattering wave fields is measured in order to allow a reduction of the cost of the measurement apparatus. In this respect, we firstly analyse the properties of the phaseless scattering nonlinear forward modelling operator in its integral form and we provide an analytical expression for computing its Fréchet derivative. Then, we propose an inexact Newton method to solve the associated nonlinear inverse problems, where any linearized step is solved by a LpBanach space iterative regularization method which acts on the dual space Lp∗. Indeed, it is well known that regularization in special Banach spaces, such us Lpwith 1