Adaptive optics Using Ferro-fluids Mathieu De Goer-de Herve and Raphael-David Lasseri (ENS Cachan)

Slides:

Advertisements

Similar presentations

Outline Dynamo: theoretical General considerations and plans Progress report Dynamo action associated with astrophysical jets Progress report Dynamo: experiment.

Advertisements

Finite element method Among the up-to-date methods of stress state analysis, the finite element method (abbreviated as FEM below, or often as FEA for analyses.

Mechanics of Materials II

Section 2: The Planetary Boundary Layer

Lecture 11 Colloidal interactions I. In the last lecture… h Capillary pressure due to a curved liquid interface Capillary pressure is responsible for.

Chapter 15 Fluids Dr. Haykel Abdelhamid Elabidi 1 st /2 nd week of December 2013/Saf 1435.

PTS research activities related to COST FP 1005 Simulation of micro structure mechanics in dynamic fibre networks Timo Kuntzsch, Jan Matheas, Sven Altmann.

The Ultimate Importance of Invariant Property : Rothalpy

Chapter 15 Fluids Dr. Haykel Abdelhamid Elabidi 1 st /2 nd week of December 2013/Saf 1435.

Solar Physics & upper Atmosphere Research Group University of Sheffield A possible method for measuring the plasma density profile along coronal loops.

Static Surface Forces hinge 8 m water ? 4 m.

23-28 September 2003 Basic Processes in Turbulent Plasmas Forecasting asymptotic states of a Galerkin approximation of 2D MHD equations Forecasting asymptotic.

CE 230-Engineering Fluid Mechanics Lecture # 17 Reynolds transport equation Control volume equation.

1 MECH 221 FLUID MECHANICS (Fall 06/07) Chapter 2: FLUID STATICS Instructor: Professor C. T. HSU.

Notes – Pressure & Buoyant Force

1 Chapter 9 Differential Equations: Classical Methods A differential equation (DE) may be defined as an equation involving one or more derivatives of an.

Outline  Uses of Gravity and Magnetic exploration  Concept of Potential Field  Conservative  Curl-free (irrotational)  Key equations and theorems.

Two Phase Flow Modeling Prepared by: Tan Nguyen Two Phase Flow Modeling – PE 571 Chapter 3: Stratified Flow Modeling For Horizontal and Slightly Inclined.

Gas and Liquid Metering. Why Metering? Measuring flow rate and cumulative volume Selling System Control Losses detection Reservoir outlets Pumping stations.

Smart Materials in System Sensing and Control Dr. M. Sunar Mechanical Engineering Department King Fahd University of Petroleum & Minerals.

The Air-Sea Momentum Exchange R.W. Stewart; 1973 Dahai Jeong - AMP.

Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical.

Force on Floating bodies:

ME 520 Fundamentals of Finite Element Analysis

Deformable Models Segmentation methods until now (no knowledge of shape: Thresholding Edge based Region based Deformable models Knowledge of the shape.

Enhancement of Heat Transfer P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Invention of Compact Heat Transfer Devices……

Physics of Convection " Motivation: Convection is the engine that turns heat into motion. " Examples from Meteorology, Oceanography and Solid Earth Geophysics.

CE 1501 CE 150 Fluid Mechanics G.A. Kallio Dept. of Mechanical Engineering, Mechatronic Engineering & Manufacturing Technology California State University,

Brookhaven Science Associates U.S. Department of Energy MUTAC Review January 14-15, 2003, FNAL Target Simulations Roman Samulyak Center for Data Intensive.

3. Stresses in Machine Elements Lecture Number – 3.1 Prof. Dr. C. S. Pathak Department of Mechanical Engineering Sinhgad College of Engineering, Pune Strength.

Pharos Univ. ME 259 Fluid Mechanics Static Forces on Inclined and Curved Surfaces.

Incompressible Flow over Airfoils

Chapter 13 Forces. What is Force? A push or pull You are exerting a force right now (against the chair, or against the atmosphere) Other objects are also.

Example: Radially Polarized Tube. Introduction This is a 2D static axisymmetric piezoelectric benchmark problem A radially polarized piezoelectric tube.

Panel methods to Innovate a Turbine Blade-1 P M V Subbarao Professor Mechanical Engineering Department A Linear Mathematics for Invention of Blade Shape…..

Fluid-substrate interactions; structure of fluids inside pores.

Pressure and fluid statics

An Accurate Mode-Selection Mechanism for Magnetic Fluids in a Hele-Shaw Cell David P. Jackson Dickinson College, Carlisle, PA USA José A. Miranda Universidade.

An Exclusive Conservation Equation for Ideal Turbo-machines P M V Subbarao Professor Mechanical Engineering Department Invention of New Property for CVs.

Ship Computer Aided Design Displacement and Weight.

SHINE: S eattle’s H ub for I ndustry-driven N anotechnology E ducation North Seattle College Train the NanoTeacher Workshop July 16, 2014 NanoDemos 1.

Selection of Stator-Rotor Combinations

Spin Dynamics in Ferromagnetic Microstructures Paul Crowell, University of Minnesota: DMR We are investigating the excitations of ferromagnetic.

Mecânica de Fluídos Ambiental 2015/2016

Fundamentals of adaptive optics and wavefront reconstruction Marcos van Dam Institute for Geophysics and Planetary Physics, Lawrence Livermore National.

1 The Origin of Mass: - Inertial Mass - Bonn 2010 by Albrecht Giese, Hamburg The Origin of Mass 1.

Lecture 21: FRI 06 MAR Magnetic fields Ch Physics 2102 Jonathan Dowling 28.8 Force on Current in Wire 28.9 Torque on Current Loop Magnetic.

Fluid Mechanics Chapter 9 Review. Agenda:  9.1: Fluids and Buoyant Force  9.2: Fluid Pressure and Temperature  9.3: Fluids in Motion  9.4: Properties.

Combined Loadings Thin-Walled Pressure Vessels Stress caused by Combined Loadings.

Relaminarisation of turbulent stratified flow Bas van de Wiel Moene, Steeneveld, Holtslag.

Pressure Force per unit area Units: Pa (N/m 2 ), lb/in 2, atm, torr, mmHg P = pressure, N (psi) F=force, N (lb) A= area, m 2 (in 2 )

Chapter 14 Lecture 28: Fluid Mechanics: I HW10 (problems):14.33, 14.41, 14.57, 14.61, 14.64, 14.77, 15.9, Due on Thursday, April 21.

Stability of magnetic fields in stars Vienna 11 th September 2007 Jonathan Braithwaite CITA, Toronto.

Diffraction Limit What is the best angular resolution a telescope would achieve in idealised conditions? Circular aperture: θ min ≈ 1.22 λ/d For the HST:

I- Computational Fluid Dynamics (CFD-I)

Numerical Simulations of Solar Magneto-Convection

1D OF FINITE ELEMENT METHOD Session 4 – 6

Outline Uses of Gravity and Magnetic exploration

Introduction to Fluid Mechanics

Spin Dynamics in Ferromagnetic Microstructures Paul Crowell, University of Minnesota: DMR We are investigating the excitations of ferromagnetic.

Multi-physics Simulation of a Wind Piezoelectric Energy Harvester Validated by Experimental Results Giuseppe Acciani, Filomena Di Modugno, Ernesto Mininno,

Thin-Walled Pressure Vessels Stress caused by Combined Loadings

3.2 Pressure and the Buoyant Force

CE 356 Elements of Hydraulic Engineering

Analysis of Flow Beyond the Stage in A Multi Stage Turbine

Asymptotic Nonlinearities in Smectics

University of Liège Department of Aerospace and Mechanical Engineering

Fluid statics Hydrostatics or Fluid Statics is the study of fluids at rest. It's practical applications are numerous. Some of which are Fluid Manometers,

General Principles 4/10/2019.

II. Theory for numerical analysis of multi-phase flow (Practice)

Presentation transcript:

Adaptive optics Using Ferro-fluids Mathieu De Goer-de Herve and Raphael-David Lasseri (ENS Cachan)

Resolution in optics Two limitant factors : → Diffraction → Atmosphere turbulences : speckle patterns. Characteristic length D Airy disc : Ø = λx f/D Characteristic length dc (correlation) dc~10cm Disc : Ø = λx f/dc D Ø

What solution? High places Adaptive optics

How? ● Mechanics deformation of a “usual” mirror using piezoelectric devices

How? ● Mechanics deformation of a “usual” mirror using piezoelectric devices ● Shack-Hartmann wavefront sensor

Ferrofluids General definition: Colloidal suspensions of magnetic nanoparticles conferring super-paramagnetic properties to the fluid. When a magnetic field is applied to the system their magnetic moments tend to align along the applied field, leading to a net magnetization.

Field of the study

Rosenweig instability Domain of Stability “Smooth surface” Domain of the RW Instability “Hedgehog surface” B>Bc B<Bc

Approximations : We will neglect the influence of the capillary forces in this stable domain, 3 Major Factors: - Gravity -Magnetostrictive Pressure - Laplace Forces When the Equilibrium is reached -> Bernouilli Generalised Equation (1) MHD Fundamentals Equations

Numerical Resolution Finite Element Method applied to model the interaction of the field and the fluid. Field of a cylindric shaped magnet Height of the ferrofluid sample (From Top)

Experiment VS Theory Numerical approach Deformation of the fluid above the magnet Physical Experiment Ferrofluid sample subjected to a strong magnet

Validation of the model

Classic methods Mechanics deformation of a “usual” mirror using piezoelectric devices

Applications to adaptive optics Generic principle of adaptive optics

Some examples Results using classic adaptive Final Results (NGC 7469 Galaxy)

Liquid Mirror A well-know Patent (Ernesto Capocci -1856)