Browsing by Author "Russo, Nélida A."

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    Application of a long-rangesweptsource optical coherence tomography-based scheme for dimensional characterization of multilayer transparent objects
    (2017-08-18) Morel, Eneas Nicolás; Russo, Nélida A.; Torga, Jorge Román; Duchowicz, A.N.
    This work presents the use of a recently develop edinter ferometric system based on the swept source optical coherence tomography (SS-OCT) technique, which allows the characterization of transparent and semitransparent multilayer systems employing a tunablefiber-optic laser with a coherence length suitable for achieving long-deeprange imaging (<10  cm). The inclusion of fiber Bragggratings in the system allow sit to perform a self-calibration in each sweep of the light source. Measurements carried out on cuvettes, ampoules, small bottles, and glass containers used in the pharmaceutic al industry are presented. The thicknesses of the walls and the distance between them were determined. Transparent and semitransparent objects of a multilayer type of different thicknesses were also measured. The configuration presented allow sextension of the measurement range obtainable with the usual OCT systems, demonstrating the potentiality of the proposed scheme to carry out quality control in industrial applications.
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    Dimensional characterization of large opaque samples and microdeformations by low coherence interferometry
    (2020-01-25) Torga, Jorge Román; Morel, Eneas Nicolás; Russo, Nélida A.; Duchowicz, Ricardo
    We report on the application of an interferometric system based on the low-coherence interferometry technique to the dimensional characterization of large opaque mechanical parts as well as microdeformations experienced by them. The implemented scheme is capable of simultaneously measuring very small deformations and relatively large dimensions or thicknesses (several centimeters) of the sample. By applying the chirp Fourier transform algorithm, it was possible to measure changes in thickness with an uncertainty of 0.35  μm when a 7-cm-thick sample was measured. The measurement scheme was implemented in optical fiber, which makes it highly adaptable to industrial conditions. It employs a tunable light source and a Sagnac–Michelson configuration of the interferometric system that allows the thickness of the opaque sample and the topography of both faces to be obtained simultaneously. The developed system can be used to perform profilometry of opaque samples and to analyze the dimensional behavior of mechanical pieces in production lines or under mechanical efforts capable of introducing some deformations on them. This feature enables the system to perform quality control in manufacturing processes.
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    Interferometric system based on swept source-optical coherence tomography scheme applied to the measurement of distances of industrial interest
    (2015-12-11) Morel, Eneas Nicolás; Russo, Nélida A.; Torga, Jorge Román; Duchowicz, Ricardo
    We used an interferometric technique based on typical optical coherence tomography (OCT) schemes for measuring distances of industrial interest. The system employed as a light source a tunable erbium-doped fiber laser of ∼20-pm bandwidth with a tuning range between 1520 and 1570 nm. It has a sufficiently long coherence length to enable long depth range imaging. A set of fiber Bragg gratings was used as a self-calibration method, which has the advantage of being a passive system that requires no additional electronic devices. The proposed configuration and the coherence length of the laser enlarge the range of máximum distances that can be measured with the common OCT configuration, maintaining a good axial resolution. A measuring range slightly >17 cm was d0.etermined. The system performance was evaluated by studying the repeatability and axial resolution of the results when the same optical path difference was measured. Additionally, the thickness of a semitransparent medium was also measured.