A new method for generating and analysing digital speckle shearing correlation fringe patterns

摘要

A method for generating a high visibility digital speckle shearing fringe pattern is proposed. A three-step phase shifting technique which involves the introduction of arbitrary phases is utilized. The phase shifting technique is carried out using a rotating mirror and a theoretical model which involves a linear correlation algorithm is discussed. Experimental results showing correlation fringe patterns and a deformation phase map are presented. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 5]