Abstract

Three dimensional inspection techniques for industrial applications are normally based on either photogrammetric, triangulation or time-of-flight techniques. Combining the latter with an optical demodulation method offers the possibility to obtain 2D and 3D information of a scene. The target is illuminated by a high frequency intensity modulated laser beam. An imaging system forms an intermediate image inside an electro-optic modulator and finally a CCD-camera captures the 3D-image of the object where the intensity of each camera pixel corresponds to the phase shift and therefore the distance between the illuminated object pixel and the optical demodulator.

© 1996 IEEE