Abstract
The internal structure of a sample of an absorber is retrieved from its measured scattered field. By its very nature, this target is a very weak-scatterer as it is used to cover the walls in anechoic chambers. The real part of its permittivity is rather small but its dielectric losses are non negligible. Quantitative maps of the complex permittivity of the sample were obtained from monochromatic scattered fields measured inside an anechoic chamber in a multistatic configuration. An imaging procedure taking into account the noise characteristics disturbing the measurements was used for this purpose.
Highlights
Microwave imaging has attracted great interest in the research community as it intervenes in several practical applications, for example, biomedical imaging, subsurface imaging and non-destructive testing
There is still a significant step to make in order to achieve quantitative three-dimensional microwave imaging of natural structures
We have shown our capacity to quantitatively characterize the inner composition of a very weak scatterer from its measured scattered field
Summary
Microwave imaging has attracted great interest in the research community as it intervenes in several practical applications, for example, biomedical imaging, subsurface imaging and non-destructive testing. There is still a significant step to make in order to achieve quantitative three-dimensional microwave imaging of natural structures. With this in mind, recent developments concern the extension and acceleration of inverse scattering algorithms to tackle 3D targets [1]–[4]. Progresses on the measurements of scattered fields allow to accurately measure 3D structures in free space [5]–[7] or in confined microwave systems. There is still few contributions concerning 3D quantitative imaging from experimental data due to the sensitivity of such algorithms [6], [9]–[12]. Until now, laboratory conditions are needed to acquire such measurements due to the requested accuracy
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