Mikrodalga görüntüleme için menzil testi yöntemi

Microwave imaging is the imaging technology that utilizes the electromagnetic illumination at microwave frequency range to be able to remotely detect, sense or image the targeted objects located in some domain. Besides being a very popular and edge cutting technology of today's science, the microwave imaging attracts a lot attention due to its wide application areas ranging from nondestructive testing to military applications. The microwave imaging methods can be grouped into two main branches with respect to their aimed goals: qualitative microwave imaging techniques, quantitative microwave imaging methods. The latter group, quantitative microwave imaging methods, desires to estimate the electrical parameters of the targets in a host medium by means of the electromagnetic measurements realized at microwave frequency range whereas the first group of methods, qualitative microwave imaging techniques, aims only to estimate the shape and the position of targets hosted in a specific part of the space. The quantitative microwave imaging techniques is generally known with their higher demands, i.e. high computational cost, large computational space, longer computational times. On the other hand, the quantitative microwave imaging methods produces outputs of both the electrical parameters and the shape & locations of the targets, thus their potentials is higher. The qualitative microwave imaging techniques, which were developed in 1990s primarily by mathematicians, generally requires less computational space, efficient in computational cost and time. Giving outputs of the shape and location information, the qualitative microwave imaging techniques have a special importance due to their potentials in popular problems that is came across in today's microwave imaging technology. This thesis investigates the Range Test Method, which is one of the qualitative inversion algorithms developed by Potthast in 2000s. This method tests the scattered field with arbitrarily selected test domains for analytic extensibility on the selected domain. By doing so, the Range Test Method calculates the region to which the scattered field is analytically extensible. This region is called as the convex hull of the scattering targets and it is larger or equal to the exact support of the target. The advantages of the Range Test Method is in fact squeezing the investigation domain on which the quantitative methods searches for the exact shapes, locations and electrical properties of the targets. It is well known that the inverse scattering problem is severely ill-posed thus the initialization of the qualitative imaging methods is quite important to obtain accurate results. In this respect the Range Test Method can provide an important information, which is a squeezed region that encloses the scatterers, for accurate and efficient solution of the ill-posed inverse scattering problem.