PHASE DETERMINATION OF A RADIATION WAVE FIELD

摘要

A method of imaging an object including the steps of exposing the object to a radiation wave field from a source, producing a representative measure of the rate of change of intensity over a selected surface extending generally across the wave field on the side of the object remote from incident radiation and producing a representative measure of intensity of said radiation wave field over said selected surface. <??>The method further comprises the steps of transforming said measure of rate of change of intensity to produce a first integral transform representation and applying to said first integral transform representation a first filter corresponding to the inversion of a first differential operator reflected in said measure of rate of change of intensity to produce a first modified integral transform representation, further applying an inverse of said first integral transform to said first modified integral transform representation to produce an untransformed representation and applying a correction based on said measure of intensity over said selected surface to said untransformed representation. It further comprising the steps of transforming the corrected untransformed representation to produce a second integral transform representation and applying to said second integral transform representation a second filter corresponding to the inversion of a second differential operator reflected in the corrected untransformed representation to produce a second modified integral transform representation and applying an inverse of said second integral transform to said second modified integral transform representation to produce a measure of phase of said radiation wave field across said selected plane. <IMAGE>