Gc. Jin et al., APPLICATIONS OF A NOVEL PHASE-SHIFT METHOD USING A COMPUTER-CONTROLLED POLARIZATION MECHANISM, Optical engineering, 33(8), 1994, pp. 2733-2737
A new computer-controlled phase-shifting apparatus based on polarizati
on techniques is developed. This apparatus changes phase only by rotat
ing a polarizer using a precise step motor and a specially designed de
celerator. The precision of this method can be higher than other metho
ds because of the accurate control of the rotating angle. Four applica
tions of this technique to optical interferometry and 3-D shape measur
ements are presented.