Single phase-step algorithm for phase difference measurement using ESPI

Meinhard Sesselmann; Armando Albertazzi Jr.

doi:10.1117/12.312932

30 June 1998 Single phase-step algorithm for phase difference measurement using ESPI

Meinhard Sesselmann, Armando Albertazzi Jr.

Author Affiliations +

Proceedings Volume 3478, Laser Interferometry IX: Techniques and Analysis; (1998) https://doi.org/10.1117/12.312932
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

The paper describes a new algorithm that uses only two mutually phase-stepped interferograms per deformation state in order to retrieve modulo 2(pi) the phase signal due to deformation. It is suited for use in ESPI where the initial phase in the interference term is the phase of speckle that varies randomly over the imaging sensor. Any phase step value except those close to multiples of (pi) can be applied. Practical advantages of the algorithm are outlined. An analysis of phase measurement uncertainty is presented, results are discussed and compared with those from standard phase-shifting algorithms. Obtained results prove that measurement uncertainties smaller 2(pi) /20 are feasible.

Citation Download Citation

Meinhard Sesselmann and Armando Albertazzi Jr. "Single phase-step algorithm for phase difference measurement using ESPI", Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); https://doi.org/10.1117/12.312932

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