Scanning moiré and phase shifting with time delay and integration imaging

Optics Letters
M R SajanA Asundi

Abstract

Scanning moiré is generated by undersampling of a phase-modulated grating pattern. In projection profilometry the scanning moiré pattern represents equal height and depth contours on a test object. By use of time delay and integration (TDI) imaging, it is possible to generate an on-line scanning moiré pattern from the complete periphery of a rotating cylindrical object. For automated phase and profile unwrapping from scanning moiré fringes, phase-shifting interferometry techniques are most desirable. However, lack of spatial information in the undersampled scanning moiré fringes introduces serious errors in phase unwrapping. We report a method that uses oversupply of data to balance the effect of undersampling. This oversupply is achieved with a TDI feature that permits programmable image magnification in the scanning direction.

References

Aug 1, 1977·Applied Optics·M IdesawaT Soma
Dec 1, 1994·Applied Optics·A Asundi, M R Sajan
Dec 10, 1996·Applied Optics·X XieD R Burton

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Citations

Dec 8, 2017·Applied Optics·Yun-Hui LiZhi Wang
May 14, 2021·Applied Optics·Jun-Lin LiZhong-Ming Li

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