PHASE-SHIFTING ALGORITHMS FOR NONLINEAR AND SPATIALLY NONUNIFORM PHASE-SHIFTS - COMMENT

In the framework of phase-shifting interferometry, the characteristic polynomial theory is extended to deal with nonlinear and nonuniform ph ase-shift miscalibration. A general procedure for designing algorithms that are insensitive to those errors is presented. It is also shown h ow analytical expressions for the residual phase errors-can be obtaine d. Finally, it is demonstrated that the coefficients of any algorithm can be given a Hermitian symmetry. (C) 1998 Optical Society of America .