Optical tomography of phase objects with spatial filtering

Abstract

A tomographic system which includes a spatial filter suitable to detect phase projections is described. This system is expecting to render 2-D images of slices of transparent object distributions employing well-known tomographic reconstruction techniques for parallel projections. Real and complex spatial filters are considered, including very classical Schlieren filtering techniques, as dark field, Foucault knife-edge, phase-knife edge, phase contrast and others.More recent methods, as fractional methods (fractional derivatives and fractional Hilbert) are also considered.Experimental results using real filters and glass samples are also included.