Lasers, Fiber Optics, and Communications

Simple low-cost refractometer using a disposable optical fiber tip for measurements

[+] Author Affiliations
Rodolfo Martínez-Manuel

Centro de Investigaciones en Óptica, A.C. Photonics, Prol. Constitución 607, Fracc. Reserva Loma Bonita, Aguascalientes 20200, México

Óscar Esteban

University of Alcala, Photonics Engineering Group/Electronics Department, Polytechnic School, University Campus, Alcalá de Henares 28805, Spain

Mikhail G. Shlyagin

Centro de Investigación Científica y de Educación Superior de Ensenada, Departamento de Óptica, Carretera Ensenada a Tijuana 3918 3918, Ensenada, Baja California 22860, México

Opt. Eng. 55(11), 116108 (Nov 22, 2016). doi:10.1117/1.OE.55.11.116108
History: Received July 28, 2016; Accepted October 31, 2016
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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 6×104  RIU and 3×104  RIU, respectively, were demonstrated in dip-and-read experiments using replaceable disposable fiber tips.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Rodolfo Martínez-Manuel ; Óscar Esteban and Mikhail G. Shlyagin
"Simple low-cost refractometer using a disposable optical fiber tip for measurements", Opt. Eng. 55(11), 116108 (Nov 22, 2016). ; http://dx.doi.org/10.1117/1.OE.55.11.116108


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