Automatic probing of multilayered discrete homogeneous dielectric media with oblique incidence

摘要

The Fast Fourier Transform, (FFT) inversion method is newly introduced for discrete multilayer inversion. The method has the advantages of simplicity, short computation time and being robust with respect to noise. In this paper, the FFT inversion method is applied to a discrete homogeneous multilayer dielectric model using oblique incidence and a limited bandwidth. For a given model, a uniform transverse electric, (TE) plane wave is obliquely incident on the top of its surface. The corresponding reflection coefficient is sampled over a finite frequency range. The spectrum of the reflection coefficient is obtained by applying the FFT algorithm to its samples. An algorithm is given for the deduction of the height and permittivity of each layer. A software package is prepared for automatic execution of the algorithm during the whole inversion process. The algorithm is tested by using simulated data of a three-layer half space dielectric model.