Instrumentation, Techniques, and Measurement

Interferometric system based on swept source-optical coherence tomography scheme applied to the measurement of distances of industrial interest

[+] Author Affiliations
Eneas N. Morel, Jorge R. Torga

Universidad Tecnológica Nacional, Laboratorio de Optoelectrónica y Metrología Aplicada, Facultad Regional Delta, San Martin 1771, 2804 Campana, Buenos Aires, Argentina

Nélida A. Russo

Centro de Investigaciones Ópticas (CONICET-CIC), Centenario y 506, 1897 Gonnet, La Plata, Buenos Aires, Argentina

Ricardo Duchowicz

Centro de Investigaciones Ópticas (CONICET-CIC), Centenario y 506, 1897 Gonnet, La Plata, Buenos Aires, Argentina

Universidad Nacional de la Plata, Facultad de Ingeniería, Calle 1 y 47, 1900 La Plata, Buenos Aires, Argentina

Opt. Eng. 55(1), 014105 (Jan 20, 2016). doi:10.1117/1.OE.55.1.014105
History: Received September 30, 2015; Accepted December 11, 2015
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Abstract.  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 maximum distances that can be measured with the common OCT configuration, maintaining a good axial resolution. A measuring range slightly >17  cm was determined. 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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Eneas N. Morel ; Nélida A. Russo ; Jorge R. Torga and Ricardo Duchowicz
"Interferometric system based on swept source-optical coherence tomography scheme applied to the measurement of distances of industrial interest", Opt. Eng. 55(1), 014105 (Jan 20, 2016). ; http://dx.doi.org/10.1117/1.OE.55.1.014105


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