Phase Estimation in Optical Interferometry

Signal-Processing Methods in Phase-Shifting Interferometry ◾ 265

pixels and plotted the histogram with the retrieved values. is method

requires at least 2κ + 4 data frames for minimizing the kth-order harmonic.

Figure 7.9a shows the simulated fringe pattern with additive random

phase. According to Gutmann and Weber’s lattice site representation of the

retrieved phase steps, when nonlinear phase steps are applied, the lattice

site representation of the phase steps will be in the form of an ellipse. e

same is shown in Figure7.9b, which proves the nonlinearity of the applied

phase steps. Figures7.9c and 7.9d show the histograms of the ...