2026-06-28T09:50:12Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/439572023-08-26T20:28:06Zcom_20.500.14352_14col_20.500.14352_15

Two-step self-tuning phase-shifting interferometry Quiroga Mellado, Juan Antonio Vargas Balbuena, Javier Belenguer Dávila, Tomás Servín Guirado, Manuel Estrada, Julio César © 2011 Optical Society of America A two-step self-tuning phase-shifting method is presented. The phase-step between the two interferograms is not known when the experiment is performed. Our demodulating method finds, in a robust way, this unknown phase-step. Once the phase-step is estimated we proceed to phase demodulate the interferograms. Moreover our method only requires the fringe patterns to have a constant unknown phase-shift between them. As a consequence, this technique can be used to demodulate open and closed-fringed patterns without phase-sign ambiguity. The method may be regarded as a self-tuning quadrature filter, which determines the phase-shift between the two fringe patterns and finally estimates the demodulated phase map. The proposed technique has been tested with simulated and real interferograms obtaining satisfactory results. 2023-06-20T03:35:05Z 2023-06-20T03:35:05Z 2011-01-11 journal article 1094-4087 10.1364/OE.19.000638 https://hdl.handle.net/20.500.14352/43957 http://dx.doi.org/10.1364/OE.19.000638 http://www.opticsinfobase.org/ eng open access The Optical Society Of America