Please use this identifier to cite or link to this item:
Title: Demodulation of a single interferogram based on continuous wavelet transform and phase derivative
Authors: Tay, C.J. 
Quan, C. 
Sun, W. 
He, X.Y.
Keywords: Continuous wavelet transform (CWT)
Inflexion point
Micro interferometry
Phase retrieval
Issue Date: 15-Dec-2007
Citation: Tay, C.J., Quan, C., Sun, W., He, X.Y. (2007-12-15). Demodulation of a single interferogram based on continuous wavelet transform and phase derivative. Optics Communications 280 (2) : 327-336. ScholarBank@NUS Repository.
Abstract: A novel method based on continuous wavelet transform (CWT) and guidance of phase derivative is developed to measure the phase of a single fringe pattern which contains closed fringes. Wrapped phase values are retrieved by ridge extraction algorithms based on CWT which has the capability of better noise reduction and thus increases the resolution of measurement significantly. To further reduce the noise, the scales detected by maximum ridge algorithm are filtered iteratively before retrieval of wrapped phase. The proposed method also identifies any ambiguous point in a non-monotonous fringe pattern by directly tracking an inflexion point from an unwrapped phase map without the use of a carrier. The algorithm developed is validated by computer simulation and experimental results. Based on micro interferometry the experimental results for both static and dynamic deformations of a micro structure demonstrate that the proposed method is an effective tool for the analysis of closed fringe patterns and subsequent deformation measurement. However, the proposed technique is limited to measurement of surface which is relatively smooth compared to the mean wavelength of the light source. In addition, prior knowledge of the sign of surface slope is required in cases where a spatial carrier is not available or adaptable. © 2007 Elsevier B.V. All rights reserved.
Source Title: Optics Communications
ISSN: 00304018
DOI: 10.1016/j.optcom.2007.08.038
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Oct 15, 2018


checked on Oct 15, 2018

Page view(s)

checked on Jul 27, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.