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8: Determination of attenuation length. The log of D2 /flux is plotted against D, the distance between the LED and the optical module. In July 1998 and March 1999, measurements were performed with a set-up consisting of a pulsed isotropic LED source located at a distance of either 24 m or 44 m from a 1′′ fast photomultiplier tube. An 8-bit TDC measured the distribution of the arrival times of the photons. 5 ns. Because of this, photons in the tail of the distribution have scattered with an angle at least ∼ 35◦ for the 24 m spectrum, and ∼ 25◦ for 45 m.

The sediment trap collected samples from July to December 1997 on a weekly basis. The analysis of the samples was performed in the CEFREM (Centre de Formation et de Recherche sur l’Environnement Marin) laboratory by the team of Professor A. Monaco. 7, the total mass flux of sediments substantially increases from October onwards, probably as a result of heavy rainfall draining sediment from the shore. Indeed, the composition of the sediments shows a large contribution of material originating from continental river bed.

The experiment was therefore redesigned so that it used a pulsed source, to facilitate scattering measurements, and a flexible structure to improve ease of deployment. 8: Determination of attenuation length. The log of D2 /flux is plotted against D, the distance between the LED and the optical module. In July 1998 and March 1999, measurements were performed with a set-up consisting of a pulsed isotropic LED source located at a distance of either 24 m or 44 m from a 1′′ fast photomultiplier tube.

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