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Title: Improved spatial phase detection for profilometry using a TDI imager
Authors: Sajan, M.R. 
Tay, C.J. 
Shang, H.M. 
Asundi, A.
Keywords: Digital imaging
Dynamic imaging
Optical inspection
Issue Date: 1-May-1998
Citation: Sajan, M.R.,Tay, C.J.,Shang, H.M.,Asundi, A. (1998-05-01). Improved spatial phase detection for profilometry using a TDI imager. Optics Communications 150 (1-6) : 66-70. ScholarBank@NUS Repository.
Abstract: Performance of a time delay and integration (TDI) imager is analogous to a drum/periphery camera. Coupled to a modulated line generating laser diode, it is possible to use a TDI imager to encode the shape profile of a rotating cylindrical object as deformed gratings in a digital image. Among the various methods for extracting the phase from a deformed grating, the spatial phase detection (SPD) method is fast and easy to use. Errors are introduced in this method if the phase gradient is high over a grating interval. Here we propose a method to reduce the phase gradient by using a TDI feature which makes it possible to record images at variable lateral magnification. © 1998 Published by Elsevier Science B.V. All rights reserved.
Source Title: Optics Communications
ISSN: 00304018
Appears in Collections:Staff Publications

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