Microwave Inverse Scattering: Quantitative Reconstruction of Complex Permittivity for Different Applications

Christian PICHOT  Pierre LOBEL  Cedric DOURTHE  Laure Blanc-FERAUD  Michel BARLAUD  

IEICE TRANSACTIONS on Electronics   Vol.E80-C   No.11   pp.1343-1348
Publication Date: 1997/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on Electromagnetic TheoryScattering and Diffraction)
inverse problems,  iterative methods,  image reconstruction,  microwave imaging,  tomography,  nondestructive testing,  buried objects,  civil engineering,  geophysics,  

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This paper deals with two different quantitative inversion algorithms for reconstructing the complex permittivity profile of bounded inhomogeneous objects from measured scattered field data. The first algorithm involves an imaging method with single frequency excitation and multiincidence illumination and the second algorithm involves a method with synthetic pulse (multifrequency mode) excitation for objects surrounded by freespace or buried in stratified half-space media. Transmission or reflection imaging protocols are considered depending on aimed applications: microwave imaging in free-space from far-field data for target identification, microwave imaging from near-field data for nondestructive testing (NDT), microwave tomography of buried objects for mine detection and localization, civil engineering and geophysical applications. And Edge-Preserving regularization scheme leading to a significant enhancement in the image reconstructions is also proposed. The methods are illustrated with synthetic and experimental data.