Image Reconstruction of Buried Biaxial Dielectric Cylinders

• Main Authors: Chun Jen Lin, 林俊仁
• Other Authors: Chien-Ching Chiu
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/21280851016759219086

碩士 === 淡江大學 === 電機工程學系 === 89 === The inverse scattering of buried inhomogeneous biaxial dielectric cylinders is investigated. Dielectric cylinders of unknown permittivities are buried in one half space and scatter a group of unrelated waves incident from another half space where the scattered field is recorded. By proper arrangement of the various unrelated incident fields, the difficulties of ill-posedness and nonlinearity are circumvented, and the permittivity distribution can be reconstructed through simple matrix operations. The algorithm is based on the moment method and the unrelated illumination method. Numerical results are given to demonstrate the capability of the inverse algorithm. They also show that the permittivity tensor distribution of the cylinders can be successfully reconstructed even when the permittivity is fairly large. Good reconstruction is obtained even in the presence of additive random noise in measured data. In addition, the effect of noise on the reconstruction result is also investigated.