STRAIN ANALYSIS OF MOVING-OBJECTS USING A FOURIER-TRANSFORM GRID METHOD

There is no good method to measure the shape and the strain distributi ons of a structure changing with time. We have previously proposed the Fourier transform grid method (FTGM) to measure the three-dimensional shape and surface strain distributions of stationary objects by analy sing the two-dimensional grating images recorded with two cameras. In the stereoscopic method, it is very important to determine the accurat e geometric parameters of the camera system. In this paper, the positi ons and the directions of cameras are accurately determined using the FTGM applied to images of a reference object on which a two-dimensiona l grating is drawn. Applications for analysing shape and strain distri butions of vibrating rubber plates and a moving human skin are shown. Copyright (C) 1996 Elsevier Science Ltd.