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Applied Optics

Applied 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)

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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

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

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)

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  1. J. Dankin, Optical Fiber Sensors (Artech House, Norwood, Mass., 1989).
  2. S.-M. Tseng, C.-L. Chen, “Side-polished fibers,” Appl. Opt. 31, 3438–3447 (1992). [CrossRef] [PubMed]
  3. R. Alonso, F. Villuendas, J. Tornos, J. Pelayo, “New ‘in-line’ optical-fibre sensor based on surface plasmon excitation,” Sens. Actuators A 37–38, 187–192 (1993). [CrossRef]
  4. D. Marcuse, “Investigation of coupling between a fiber and an infinite slab,” J. Lightwave Technol. 7, 122–130 (1989). [CrossRef]
  5. A. Tz. Andreev, K. Panajotov, “Distributed single-mode fiber to single-mode planar waveguide coupler,” J. Lightwave Technol. 11, 1985–1989 (1993). [CrossRef]
  6. R. Alonso, “Estudio teórico y experimental de dispositivos ópticos basados en el acoplamiento entre el modo guiado por una fibra óptica y estructuras multicapa incluyendo medios metálicos,” Ph.D. dissertation (Universidad de Zaragoza, Spain, 1995).
  7. K. S. Shifrin, Physical Optics of Ocean Water (American Institute of Physics, New York, 1988).
  8. X. Quan, E. S. Fry, “Empirical equation for the index of refraction of seawater,” Appl. Opt. 34, 3477–3480 (1995). [CrossRef] [PubMed]

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