Geometrical optics modeling of the grating-slit test

Chao Wen Liang, Jose Sasian

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


A novel optical testing method termed the grating-slit test is discussed. This test uses a grating and a slit, as in the Ronchi test, but the grating-slit test is different in that the grating is used as the incoherent illuminating object instead of the spatial filter. The slit is located at the plane of the image of a sinusoidal intensity grating. An insightful geometrical-optics model for the grating-slit test is presented and the fringe contrast ratio with respect to the slit width and object-grating period is obtained. The concept of spatial bucket integration is used to obtain the fringe contrast ratio.

Original languageEnglish
Pages (from-to)1738-1744
Number of pages7
JournalOptics Express
Issue number4
StatePublished - 19 Feb 2007


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