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Statistical self-calibrating algorithm for three-sample phase-shift interferometry

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: A. Dobroiu, P.C. Logofatu, D. Apostol and V. Damian

Editorial: Meas. Sci. Technol., 8(7), p.738-745, 1997.


A new self-calibrating algorithm is described that succeeds in
reconstructing an almost error-free wavefront from only three interferograms. The algorithm is based on the assumption that the optical phase, taken modulo 2, is quasi-uniformly distributed in the range [0, 2) over the field of the interferograms. When the actual reference phases differ from those considered in the phase computation program a non-uniform histogram of the computed phase results. An analysis of this histogram allows a fitting procedure to find the actual phase shifts. Eventually an accurate shape of the wavefront can be calculated or a corrected signal can be sent to the phase-shifting device.

Cuvinte cheie: interferometrie de salt de faza, analiza de histograma // phase shift interferometry, histogram analysis