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Optical Engineering

Principle and implementations of a refracto-nephelo-turbidimeter for seawater measurements
Author(s): Bo Hou; Philippe Grosso; Jean-Louis M. de Bougrenet de la Tocnaye; Marc Le Menn
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Paper Abstract

Salinity and turbidity are two important seawater properties in physical oceanography. The study of physical oceanography requires a compact high-resolution in situ salino-turbidimeter to measure these two parameters in different ocean zones. Refractometry has proved to be an effective method to measure seawater salinity with a high resolution. Previous studies have shown that the transmission and scattering of light in a turbid medium impact the light beam deviation measurements, which makes the combination of salinity and turbidity measurements with the same sample mandatory. We analyze the requirements and challenges of a refracto-turbidimeter design from their measurement principles and correlations. According to these requirements, we propose a miniature refracto-nephelo-turbidimeter with a charge-coupled device, providing a salinity measurement resolution of 2  mg⋅kg −1 and a turbidity measurement resolution of 1% of the measurement range. Based on this refracto-nephelo-turbidimeter, different embodiments are discussed to meet the different requirements for different ocean zones.

Paper Details

Date Published: 3 April 2013
PDF: 7 pages
Opt. Eng. 52(4) 044402 doi: 10.1117/1.OE.52.4.044402
Published in: Optical Engineering Volume 52, Issue 4
Show Author Affiliations
Bo Hou, TELECOM Bretagne (France)
Philippe Grosso, TELECOM Bretagne (France)
Jean-Louis M. de Bougrenet de la Tocnaye, TELECOM Bretagne (France)
Marc Le Menn, Service Hydrographique et Oceanographique de la Marine (France)

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