Phase-Shifting Method with Unknown Intervals in Phase-Shifting Digital Holography


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Displacement measurement can be performed with high accuracy using phase-shifting method. In phase-shifting method, it is often used four steps of phase-shifting for one cycle. In conventional method, to measure the displacement of an object by an interferometer, the phase of a reference beam should be shifted by every π/2 in the four-step phase-shifting. In this paper, a phase-shifting method with unknown intervals is proposed. This method does not need to shift a phase by every π/2. It can detect an intensity distribution and a phase distribution from five fringe images with equal intervals even if the phase-shift amount is unknown. Using this method, we propose a displacement measurement of phase-shifting digital holographic interferometry using spherical wave as reference wave.



Edited by:

J.M. Dulieu-Barton and S. Quinn




T. Kita et al., "Phase-Shifting Method with Unknown Intervals in Phase-Shifting Digital Holography", Applied Mechanics and Materials, Vols. 3-4, pp. 211-216, 2005

Online since:

August 2006




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