Generalized phase-shifting phase retrieval approach based on time-domain fourier transform

An generalized phase-shifting phase retrieval approach based on time-domain Fourier transform (TFT) is proposed. There is no the special requirement for the phase shift calibration, and the measured phase can be retrieved quickly from a sequence of interferograms whose phase shifts are changed monotonously. By using Fourier transform to obtain the object's phase point-by-point from the frequency domain, the proposed method not only has good anti-interference performance, but also the fringe number of the interferogram is not required. Even in the case that the fringe number of the interferogram is less than one, the proposed approach still works well. Both the numerical simulation and experimental results show that the proposed approach is simple, convenient, fast and high precision. ©, 2015, Science Press. All right reserved.