Abstract
Microwave tomography is an effective technique to estimate material distribution, where inverse scattering analysis is performed on the assumption that accurate information on the incident field is known for a measurement curve as well as in the target region. In reality, however, the information may often be unobtainable due to multiple scattering between the transmitting antenna and the target object, or existence of unwanted waves and obstacles. In this paper, a method to extract information on incident fields from measured total field data is proposed. The validity of the proposed method is verified on 2D TMz problems, where a cylindrical, a square, and an L-shape homogeneous object are employed as a target object. Furthermore, it is shown that the method is available even when there are unwanted obstacles outside the measurement curve.
Highlights
Microwave tomography based on inverse scattering analysis is a promising technology for nondestructive testing, medical imaging, and geophysical exploration, among others
Have been investigated and introduced into various applications. These methods usually assume that explicit information on an incident wave is known in the estimated domain, including target objects, as well as on a measurement curve
In some cases, it is necessary to consider the effect of multiple scattering between the source and the target object, or the existence of unwanted waves and obstacles outside the measurement curve
Summary
Microwave tomography based on inverse scattering analysis is a promising technology for nondestructive testing, medical imaging, and geophysical exploration, among others. Have been investigated and introduced into various applications These methods usually assume that explicit information on an incident wave is known in the estimated domain, including target objects, as well as on a measurement curve. An inverse-scattering-analysis technique, using only measured total field data, has been developed [7,8] This method is based on the field equivalence principle. The regions—interiorregion region i and exterior region Ωe—by a closed measurement curve C of radius R. object is located in Ωi , while impressed source, unwanted obstacles, and sources of unnecessary. C; thealong inverse i (incoming wave) in region Ωi from the datamagnetic of total electric and magnetic measured the scattering problem can be analyzed in the usual way. Curve C; the inverse scattering problem can be analyzed in the usual way
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