We present a novel procedure of phase recovery from undersampled phase-shifted interferograms. First, we use synthetic interferograms to calculate the wrapped phase differences along two orthogonal directions. Second, we unwrap them to recover the true Laplacian of the phase. The final step is to integrate the unwrapped phase differences to give the searched phase. This method may be used with either path independent or path dependent phase unwrapping algorithms. The technique overcomes the sensitivity to noise of previous algorithms when low pass filtering techniques are applied during the calculation of the phase differences and least square methods are employed in the final step of phase integration.

Date Published: 20 June 2002
PDF: 12 pages
Proc. SPIE 4777, Interferometry XI: Techniques and Analysis, (20 June 2002); doi: 10.1117/12.472230

Published in SPIE Proceedings Vol. 4777:
Interferometry XI: Techniques and Analysis
Katherine Creath; Joanna Schmit, Editor(s)