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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 25 — Sep. 1, 1999
  • pp: 5267–5271

Measurement of the degree of salinity of water with a fiber-optic sensor

Óscar Esteban, Maria Cruz-Navarrete, Agustín González-Cano, and Eusebio Bernabeu  »View Author Affiliations


Applied Optics, Vol. 38, Issue 25, pp. 5267-5271 (1999)
http://dx.doi.org/10.1364/AO.38.005267


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Abstract

A fiber-optic sensor based on surface-plasmon resonance for the determination of the refractive index is used for measuring the degree of salinity of water. The transducing element consists of a multilayer structure deposited on a side-polished monomode optical fiber. Measuring the attenuation of the power transmitted by the fiber shows that a linear relation with the refractive index of the outer medium of the structure is obtained. The system is characterized by use of a varying refractive index obtained with a mixture of water and ethylene glycol. Experimental results show that the sensor can be used as a salinity-degree measurement device with environmental applications.

© 1999 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(010.7340) Atmospheric and oceanic optics : Water
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.4630) Instrumentation, measurement, and metrology : Optical inspection
(240.6680) Optics at surfaces : Surface plasmons
(310.2790) Thin films : Guided waves

History
Original Manuscript: February 17, 1999
Revised Manuscript: May 21, 1999
Published: September 1, 1999

Citation
Óscar Esteban, Maria Cruz-Navarrete, Agustín González-Cano, and Eusebio Bernabeu, "Measurement of the degree of salinity of water with a fiber-optic sensor," Appl. Opt. 38, 5267-5271 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-25-5267

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