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|Title:||Scanning moiré and phase shifting with time delay and integration imaging|
|Authors:||Sajan, M.R. |
|Source:||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|
|Appears in Collections:||Staff Publications|
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