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Optical Engineering

Simple low-cost refractometer using a disposable optical fiber tip for measurements
Author(s): Rodolfo Martínez-Manuel; Óscar Esteban; Mikhail G. Shlyagin
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Paper Abstract

A simple but accurate fiber-optic refractometer based on Fresnel reflection in the tip of a single-mode optical fiber is reported. The refractometer can be easily assembled using a distributed feedback laser as a light source and standard low-cost fiber-optic components. The short section of an optical fiber cleaved at right-angle in both tips is used as a disposable needle-type sensor head. The sensing fiber being connected with the angle-cleaved lead fiber forms a stable reflector used for light intensity reference. Signals from the sensing and reference fiber tips, generated by modulating the laser optical frequency with a sawtooth-wave form, are demultiplexed using methods of optical frequency-modulated continuous-wave interferometry. Despite the simplicity of the device, a repeatability and reproducibility of 6×10−4  RIU and 3×10−4  RIU, respectively, were demonstrated in dip-and-read experiments using replaceable disposable fiber tips.

Paper Details

Date Published: 22 November 2016
PDF: 5 pages
Opt. Eng. 55(11) 116108 doi: 10.1117/1.OE.55.11.116108
Published in: Optical Engineering Volume 55, Issue 11
Show Author Affiliations
Rodolfo Martínez-Manuel, Centro de Investigaciones en Óptica, A.C. (Mexico)
Óscar Esteban, Univ. de Alcalá (Spain)
Mikhail G. Shlyagin, Ctr. de Investigación Científica y de Educación Superior de Ensenada B.C. (Mexico)

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