In situ salinity measurements in seawater with a fibre-optic probe

Type Article
Date 2006-08
Language English
Author(s) Diaz Herrera N1, Esteban O2, Navarrete M3, Le Haitre Michel4, Gonzalez Cano A1
Affiliation(s) 1 : Univ Complutense Madrid, Dept Opt, Escuela Univ Opt, Madrid 28037, Spain.
2 : Univ Alcala de Henares, Dept Elect, Madrid 28771, Spain.
3 : Univ Complutense Madrid, Dept Opt, Fac Ciencias Fis, E-28040 Madrid, Spain.
4 : IFREMER, Ctr Brest, Lab TSMI, TSI,ME, F-29280 Plouzane, France.
Source Measurement Science and Technology (0957-0233) (Institute of Physics), 2006-08 , Vol. 17 , N. 8 , P. 2227-2232
DOI 10.1088/0957-0233/17/8/024
WOS© Times Cited 44
Keyword(s) Resonance, Surface plasmon, Salinity measurement, Fibre optics sensors
Abstract We have successfully proved the feasibility of an optical salinity meter for marine applications in a two week measurement campaign, carried out for the realization of in situ salinity measurements in seawater. An optical instrument (optode), in which the main element is a fibre-optic refractive-index sensor based on surface plasmon resonance (SPR), has been developed for that purpose, and has been especially designed to be able to operate in realistic conditions. The performance of the optode has been evaluated on an oceanographic ship in the Baltic Sea, close to the Vistula estuarine area. The obtained results ( in different tests, such as depth-profiling, towing and stationary measurements) show good correlation with the data provided by a commercial probe. Although the device is currently a part of a more complex measuring platform and uses an axial spectrograph as detector, the output power measurement used and the simplicity of its conception allow us to conceive a closed, extremely compact set-up which can be in principle commercially competitive with existing sensors.
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