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Proceedings Paper

Design and optimization of an optical refractometer for remote measurements via fiber-optic cables
Author(s): S. Khotiaintsev; C. E. García-Guerra; J. E. Morales-Farah; S. Perez-Garcia; L. E. Yam-Ontiveros
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Paper Abstract

This paper presents a fiber-optic refractometer which can operate via long fiber-optic cables. We address the relationship between the span and the linearity of the small micro-optical evanescent-field transducer with spherical working surface used in the sensor, under different parameter combinations. We designed the transducer for the range of 1.333<n<1.358, which is of main practical interest in measurements of water salinity. Another version of virtually the same transducer was designed for the range of 1.333<n<1.380, which corresponds to concentrations of sodium chloride in water from zero to saturation. We also addressed the effect of the unstable optical source and loss in the connecting fiber-optic cables, on the readings of the refractometer. We significantly reduced these negative effects by implementing the refractometer in an optical bridge configuration followed by an analogue optoelectronic signal processing unit. This made the refractometer almost insensitive to the parasitic variation of optical source and loss in the fiber-optic cables which connects the optical probe with the optoelectronic unit. Due to these measures, this refractometer can successfully operate via long fiber-optic cables. It can have applications such as in the food industry, where salt-brine solutions of various concentrations are widely used.

Paper Details

Date Published: 17 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77535U (17 May 2011); doi: 10.1117/12.886083
Show Author Affiliations
S. Khotiaintsev, Univ. Nacional Autónoma de México (Mexico)
C. E. García-Guerra, Univ. Nacional Autónoma de México (Mexico)
J. E. Morales-Farah, Univ. Nacional Autónoma de México (Mexico)
S. Perez-Garcia, Univ. Nacional Autónoma de México (Mexico)
L. E. Yam-Ontiveros, Univ. Nacional Autónoma de México (Mexico)


Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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