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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 32 — Nov. 10, 2003
  • pp: 6514–6519

Determination of global phase shifts between interferograms by use of an energy-minimum algorithm

Cheng-Shan Guo, Zhen-Yu Rong, Jing-Liang He, Hui-Tian Wang, Lü-Zhong Cai, and Yu-Rong Wang  »View Author Affiliations


Applied Optics, Vol. 42, Issue 32, pp. 6514-6519 (2003)
http://dx.doi.org/10.1364/AO.42.006514


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Abstract

A new algorithm for precise determination of the global phase shift between two interferograms is introduced. First we calculate the frame difference between the first and the second interferogram; the difference is multiplied by a properly chosen test phase factor, and then we implement a two-dimensional Fourier transform of the frame difference and calculate the energy of the first positive (or negative) diffraction order. An iterative approach is used for the test phase to ensure that the minimum energy is obtained, and then the correct phase shift value is found. This method is called the energy-minimum Fourier transform method, which is accurate and noise insensitive compared with the single-point Fourier transform method. Both the theoretical analysis and experimental results are given.

© 2003 Optical Society of America

OCIS Codes
(050.5080) Diffraction and gratings : Phase shift
(070.4560) Fourier optics and signal processing : Data processing by optical means
(120.2880) Instrumentation, measurement, and metrology : Holographic interferometry
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

History
Original Manuscript: February 8, 2003
Revised Manuscript: July 9, 2003
Published: November 10, 2003

Citation
Cheng-Shan Guo, Zhen-Yu Rong, Jing-Liang He, Hui-Tian Wang, Lü-Zhong Cai, and Yu-Rong Wang, "Determination of global phase shifts between interferograms by use of an energy-minimum algorithm," Appl. Opt. 42, 6514-6519 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-32-6514

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