PHASE SUPERPOSITION PROCESSING FOR ULTRASONIC-IMAGING

In order to improve the resolution of defect reconstruction for non-de structive evaluation, a new phase superposition processing (PSP) metho d has been developed on the basis of a synthetic aperture focusing tec hnique (SAFT). The proposed method synthesizes the magnitudes of phase -superposed delayed signal groups. A satisfactory image can be obtaine d by a simple algorithm processing time domain radio frequency signals directly. In this paper, the theory of PSP is introduced, and some si mulation and experimental results illustrating the advantage of PSP ar e given. (C) 1996 Academic Press Limited