Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15459
Title: Development of optical phase evaluation techniques: Application to fringe projection and digital speckle measurement
Authors: CHEN LUJIE
Keywords: phase evaluation, phase quality, fringe pattern analysis, speckle pattern analysis, shape measurement, optical metrology
Issue Date: 30-May-2006
Source: CHEN LUJIE (2006-05-30). Development of optical phase evaluation techniques: Application to fringe projection and digital speckle measurement. ScholarBank@NUS Repository.
Abstract: This thesis proposed optical phase evaluation techniques that covered three stages of the optical fringe analysis process, namely wrapped phase extraction, phase quality identification, and post-processing of an unwrapped phase map. The proposed techniques were applied on fringe projection and digital speckle measurement. They provided solutions to existing problems, such as simplification of the data-recording process, discontinuous surface profile measurement, automation enhancement of digital filtering algorithms, and elimination of nonlinearity in phase-to-height conversion. Mathematical principles including phase-shifting, least squares method, continuous wavelet transform, and series analysis were used in the theoretical development. Validity and reliability of the reported algorithms were tested on various specimens. It was concluded from the results that the proposed phase evaluation techniques could facilitate an advanced integration of optical metrology with computer technology.
URI: http://scholarbank.nus.edu.sg/handle/10635/15459
Appears in Collections:Ph.D Theses (Open)

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