Mechanical vibrations in the frame of an interferometer can introduce a space-dependent factor throughout an interferogram, making its analysis quite difficult. This factor is formally equivalent to the modulus of the complex degree of coherence in the case of quasimonochromatic light. A simple method for retrieving the underlying phase distribution and detecting small perturbations is presented. Introducing an appropriate correction for the above-mentioned factor, good sensitivity is also achievable in noisy environments.
© 1989 Optical Society of America
Original Manuscript: March 3, 1988
Published: March 15, 1989
Luca Crescentini, "Fringe pattern analysis in low-quality interferograms," Appl. Opt. 28, 1231-1234 (1989)