Phase-step insensitive algorithms for phase-shifting interferometry

C. T. Farrell*, M. A. Player

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


Two novel phase extraction algorithms, in which step sizes need not be known or equal, are described. One algorithm requires a minimum of five interferograms from which intensity offset and intensity modulation are calculated at each pixel and the relative phase is calculated for all pixels with respect to a reference pixel. The other algorithm requires two phase stepping mechanisms and a minimum of ten interferograms. The intensity characteristics and reference phase step are calculated at each pixel and a previously published algorithm is used for the final phase calculation.

Original languageEnglish
Article number003
Pages (from-to)648-654
Number of pages7
JournalMeasurement Science and Technology
Issue number6
Publication statusPublished - 1 Dec 1994


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