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Title: Scanning moiré and phase shifting with time delay and integration imaging
Authors: Sajan, M.R. 
Tay, C.J. 
Shang, H.M. 
Asundi, A.
Issue Date: 1-Sep-1997
Citation: Sajan, M.R.,Tay, C.J.,Shang, H.M.,Asundi, A. (1997-09-01). Scanning moiré and phase shifting with time delay and integration imaging. Optics Letters 22 (17) : 1281-1283. ScholarBank@NUS Repository.
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. © 1997 Optical Society of America.
Source Title: Optics Letters
ISSN: 01469592
Appears in Collections:Staff Publications

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