| Microwave Imaging has been used in various applications such as Synthetic Aperture Radar (SAR), homeland security system to medical imaging field. Two major approaches in microwave imaging techniques include the tomography which is based on the inverse scattering problem, and radar microwave imaging which is based on the backscattered responses. In this thesis, a new method for microwave imaging by using the Automated Free Space scanning system is investigated based on the backscattered field. The normalized scattered field of a silicone sample with buried aluminum sphere is designed and simulated by the finite element method. The scanning measurements of Plexiglas plate with Foil on its backside at different positions are also performed. Based on the reflection coefficient of these measurements, we can detect the location of the hidden object in the homogeneous sample. However, in order to detect the location and size of the object precisely, various techniques and algorithms have been applied such as derivative method, curve fitting method, correlation and wavelet analysis. This research can be further improved for applications to more realistic imaging problems such as detection of IEDs and sub wavelength tumors in breast tissue. |
