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Fluctuations du travail et de la chaleur dans des systèmes mécaniques hors d'équilibre

Abstract : This thesis presents an experimental study of work and heat fluctuations of mechanical systems driven out of equilibrium. The aim is to test recent theoretical approaches mainly due to Jarzynski, Crooks, Gallavotti, Cohen, van Zon and coworkers. In a first chapter, we introduce these new results and motivate the need for performing experiments to test them. The second chapter is dedicated to the principles and to the experimental apparatus and device: a differential interferometer, inspired from the Nomarski technique, allows us to measure the thermal sub-nanometric displacements of mechanical dissipative oscillators. A third chapter is dedicated to the principle and to the setup of a new denoising technique inspired from Wiener's filtering. This technique allows us to strongly reduce the environmental noise transmitted to the experimental systems of interest. In the last two chapters, we experimentally and theoretically study work and heat production thermal fluctuations of small mechanical dissipative oscillators driven out of equilibrium.
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Contributor : Frédéric Douarche <>
Submitted on : Thursday, December 8, 2005 - 2:16:08 PM
Last modification on : Wednesday, November 20, 2019 - 2:59:51 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:46:37 PM


  • HAL Id : tel-00011171, version 1


Frédéric Douarche. Fluctuations du travail et de la chaleur dans des systèmes mécaniques hors d'équilibre. Analyse de données, Statistiques et Probabilités []. Ecole normale supérieure de lyon - ENS LYON, 2005. Français. ⟨tel-00011171⟩



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