Practical versus absolute salinity measurements: New advances in high performance seawater salinity sensors |
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| Authors: | Philippe Grosso Marc Le Menn Jean-Louis De Bougrenet De La Tocnaye Zong Yan Wu Damien Malardé |
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| Institution: | 1. Telecom-Bretagne, Département Optique, UMR CNRS 6082 FOTON, CS 83818, 29238 Brest Cedex 3, France;2. Laboratoire de Métrologie et de Chimie Océanographique, SHOM, 13 rue du Châtelier, BP 30316, 29603 Brest Cedex, France |
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| Abstract: | Optical salinity sensors described here measure directly the seawater refractive index and thus enable a measurement of the seawater density and composition variation. We detail the measurement dependence to environmental parameters (in particular temperature and pressure) compared to conductivity sensors, and demonstrate that it may be advantageous to directly measure refractive index rather than electrical conductivity and so obtain a more direct route to density and absolute salinity. |
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