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Keywords = dual-aperture common-path interferometer

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10 pages, 7996 KB  
Article
A Real-Time Automated System for Dual-Aperture Common-Path Interferometer Phase-Shifting
by Antonio Barcelata-Pinzón, Ricardo Iván Álvarez-Tamayo and Patricia Prieto-Cortés
Appl. Sci. 2021, 11(16), 7438; https://doi.org/10.3390/app11167438 - 13 Aug 2021
Cited by 6 | Viewed by 2702
Abstract
We report a novel fully real-time automatized optomechatronic dual-aperture common-path interferometer system for obtaining the phase difference between two interferograms by using the technique of phase-shifting interferometry. A motorized system is used to shift an additional phase transversally to the optical axis by [...] Read more.
We report a novel fully real-time automatized optomechatronic dual-aperture common-path interferometer system for obtaining the phase difference between two interferograms by using the technique of phase-shifting interferometry. A motorized system is used to shift an additional phase transversally to the optical axis by ruling translation. For each high-resolution ruling displacement step of 0.793 μm, an interferogram is recorded by a CCD camera. The phase difference between the two successive recorded interferograms is then automatically calculated by computational self-calibrated algorithms. The proposed device provides more accurate measuring than typically used manual processes. Real-time phase differences are obtained from a robust low-cost optomechatronic system. Analytical calculation of the phase is performed automatically without the requirement of additional or external tools and processes, reducing the significant rework delay. A set of 47 interferograms were captured in real time then recorded and analyzed, obtaining an average phase shifting of 2.483 rad. Analytic explanation and experimental results are presented. Full article
(This article belongs to the Special Issue Optical In-Process Measurement Systems)
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