Suppressing ripple distortions and spurious pistons in phase-shifting interferometry

Ivan Choque; Moises Padilla; Manuel Servin; Sotero Ordones; Miguel Asmad

doi:10.1117/12.2568138

21 August 2020 Suppressing ripple distortions and spurious pistons in phase-shifting interferometry

Ivan Choque, Moises Padilla, Manuel Servin, Sotero Ordones, Miguel Asmad

Proceedings Volume 11490, Interferometry XX; 1149006 (2020) https://doi.org/10.1117/12.2568138
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

In this work, we deduce explicit conditions to design phase shifting algorithms (PSAs) in order to suppress errors in phase measurement, the double-frequency ripple distortion and the spurious piston. These errors arise when non-uniform phase-shifting interferograms are processed with conventional PSAs which assume uniform phase shifts. By modeling the non-uniform phase shifts as a polynomial of the unperturbed phase shift value !0, we show that the conditions for eliminating those errors are associated to the m-th derivative of the PSA's frequency transfer function (FTF). Thus, we propose an approach to design robust algorithms based on the FTF formalism, and we present a ready-to-apply eight-frame PSA. Finally, our conclusions are supported by computer simulations.

Conference Presentation

Citation Download Citation

Ivan Choque, Moises Padilla, Manuel Servin, Sotero Ordones, and Miguel Asmad "Suppressing ripple distortions and spurious pistons in phase-shifting interferometry", Proc. SPIE 11490, Interferometry XX, 1149006 (21 August 2020); https://doi.org/10.1117/12.2568138

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