Phase shining grating-slit test with a cross slit

Chao Wen Liang, Chien Fu Ou, Jose Sasian

Research output: Contribution to journalArticlepeer-review


A general graphical convolution method for fringe analysis of testing methods that use a spatially incoherent light source is presented. Results are shown for the grating-slit test using optical narrow and cross slits. The convolution method shows that phase shifting grating-slit test can be done with the cross slit at the expense of a reduced fringe contrast ratio. A phase shifting measurement with a cross-slit modulator yields high measurement precision and validates our fringe contrast theory.

Original languageEnglish
Pages (from-to)496-498
Number of pages3
JournalOptics Letters
Issue number4
StatePublished - 15 Feb 2010


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