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Theses

Détection et localisation de particules de très hautes énergies en acoustique sous-marine.

Abstract : The theme of this thesis is included in the Antares international project whose object is to build a neutrino telescope located in a deep water sea environment, near Toulon, France. In deep water sea, a neutrino can interact with a water molecule. The collision generates a luminous flash and an acoustic wave. The goal of this work is to study this acoustic sound wave and develop a system able to detect the corresponding wave front and to estimate the initial direction of the particle.
We first focus on the acoustic sound wave. Two different models are studied, and the recent works made in the CPPM lead to a mathematical expression of both signal and wave front.
Then, several detection methods are studied, from the most classical to the more recent ones. The experimental comparison in semi-real situation leads to the choice of a detection method: the Extended stochastic matched filter.
Position and direction of the neutrino are now estimated with a Gauss-Newton derivated algorithm. This estimator is based on a wave front propagation model and on the time detection information given by the telescope hydrophones. Performances of the system are then estimated.
An antenna structure is then proposed and a global simulation finalizes this thesis. In this simulation, detection and estimation are based on the results found in the previous sections. Underwater sea noise is real and the results of the simulation valid our works.
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https://tel.archives-ouvertes.fr/tel-00295026
Contributor : Nicolas Juennard <>
Submitted on : Tuesday, February 12, 2008 - 3:20:53 PM
Last modification on : Thursday, March 15, 2018 - 4:56:06 PM
Long-term archiving on: : Monday, May 17, 2010 - 7:28:46 PM

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  • HAL Id : tel-00295026, version 2

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Nicolas Juennard. Détection et localisation de particules de très hautes énergies en acoustique sous-marine.. Traitement du signal et de l'image [eess.SP]. Université du Sud Toulon Var, 2007. Français. ⟨tel-00295026v2⟩

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