New phase-stepping algorithm based on the self-consistent concept

摘要

A new concept of self-consistency is proposed in this paper and then a new phase-stepping algorithm based on it is presented. If the phase step sbetween the grabbed data frames are know, the phase distributions of every data frame can be calculated byt he modified conventional phase-stepping algorithm. On the other hand, the phase steps between data frames can be calculated through the calculated phase distributions of every data frame above. The known phase steps and the calculated phase steps should be consistent. This is so called self-consistent concept. By means of iterative method, we can easily gain the accurate phase steps while calculating the measured phase distribution. Numerical simulations and experimental results verify the insensitivity of new algorithm to the phasestepping error and automatic calibration of phase shifter.