Phase-measuring profilometry of moving object without phase-shifting device

Abstract

A new phase-measuring surface profiling technique of a moving object is proposed in the present paper. An interference fringe pattern is projected onto the object that moves at a constant speed. Multiple linear sensors are used for recording the deformed fringe pattern on the object. The phase distribution along the recording line can be calculated using a phase-shifting algorithm without any phase-shifting devices. The length of a target is not limited and a long object can be measured by the proposed method. It is expected that the proposed method can be used for the profile inspection of products moving on a conveyor system in a factory.