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DOI: 10.1088/0957-0233/20/1/015204

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Measurement Science & Technology Vol.20, Issue 1 (2009) 015204

High-resolution and compact refractometer for salinity measurements

Damien Malarde 1, Zong Yan Wu 1, Philippe Grosso 1, Jean-Louis De Bougrenet De La Tocnaye 1, M. Le Menn 2

(2009-01)

A new compact optical refractometer is presented to improve the measurement of the refractive index of seawater. These measurements are useful in oceanography to calculate density and salinity of oceans from empirical relations. This refractometer shows a lower temperature dependence and obtains a better absolute accuracy on salinity compared to the conductivity sensors which are used nowadays to assess seawater salinity. Tests and calibrations have been made in a temperature-stabilized seawater tank. They show that the prototype is capable of measuring seawater refractive index with a resolution of about ±4 × 10−7, equivalent to a salinity resolution of ±2 × 10−3 g kg−1.

1:	Fonctions Optiques pour les Technologies de l'informatiON (FOTON)
	CNRS : UMR6082 – Université de Rennes 1 – Institut National des Sciences Appliquées (INSA) - Rennes – Ecole Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT) – Institut Mines-Télécom – Télécom Bretagne – PRES Université Européenne de Bretagne [UEB]
2:	Service Hydrographique et Océanographique de la Marine (SHOM)
	Ministère de la Défense

Research team: Foton-TB Foton-CCLO

Subject

:

Engineering Sciences/Optics / Photonic Physics/Physics/Optics

Keyword(s): refractive index sensor – temperature – position sensitive device – salinity – seawater – pressure

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From: Sylvain Fève <>

Submitted on: Tuesday, 3 March 2009 17:52:52

Updated on: Monday, 22 October 2012 17:01:53