HOLOGRAPHIC CONTOURING USING DOUBLE-SOURCE TECHNIQUE AND FOURIER-TRANSFORM ANALYSIS

This paper describes a double-exposure holographic contouring techniqu e by the movement of the object beam through fibre optics. Single-mode optic fibres are used to transfer both object and reference beams. Be tween two exposures the object illumination beam is displaced. The con touring fringes can be visualised on the object surfaces. The fringe p atterns are automatically processed by the fast Fourier transform (FFT ) method, which produces a 3D perspective plot. Examples are given for different objects. (C) 1998 Published by Elsevier Science Ltd. All ri ghts reserved.