Open Engineering: Strongly Coupled Multiphysics · Open Engineering: Strongly Coupled Multiphysics OOFELIE::Multiphysics Multiphyiscs CAE Consulting •Sensors And Actuators ... Experimental

April 26th 2012 Industrial Multiphysics design for optical devices open

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Open Engineering: Strongly Coupled Multiphysics

OOFELIE::Multiphysics Multiphyiscs CAE Consulting

•Sensors And Actuators

•Multiphysics FSI

Vibro Acoustics, Electro- Technics,

FSI-CFD, Opto-Thermo Mechanics,

Thermo Mechanics


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OOFELIE Applications: Industrial Multi-Physics

Opto-Thermo Mechanics: Thermal, mechanical optic’s deformation

MEMS Design: Accelerometer, PiezoMicrophones, Sensors, RFMems

FSI-CFD: Convection, Cooling Thermo Mechanics: Package/Board Heat

Mgmnt, Deformation, Stresses Vibro Acoustics: Loudspeaker, noise prediction,

acoustic response (with courtesy of FZ)


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Deformation, stress,

temperature

OOFELIE Finite element thermo-mechanical analyses

Optical surface aberrations,

refractive index change

ZEMAX Optical analyses

Optical response

Redesign OOFELIE Optical post-processing

Dynamic Data Exchange

OOFELIE::Multiphysics linked to ZEMAX


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About ZEMAX

ZEMAX is a popular and powerful optical software used by optical engineers for the design of optical systems:

Cameras

Telescopes

Illumination devices

MOEMS

Diffractive optics

Waveguides

...

Sequential & non-sequential modes available

Physical optics propagation available


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Mechanical loads, e.g. gravity effects

Large terrestrial telescopes

Space optics

…

Thermo-mechanical effects

Global temperature changes, thermal gradients, radiative transfers, ...

Difference of thermal expansion coefficients

stresses and deformations

Piezoelectric & electrostatic actuators: active optics

Astronomy

Medical imaging

Laser applications

Telecommunication

...

Main fields of application


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Simulation examples…


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Gravity effect on Mirrors & Telescopes

Parabolic mirror

Un-obscured telescope

g

Fixed by support


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Thermo-mechanical analyses on mirrors

Mirror deformation due to heating and thermal expansion

un-matching

Heating

Fluid Cooling

Experimental test case measured by AMOS


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Satellite Optics – Three Mirror Telescope (TMA)


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Thermo-mechanical stresses and deformation of a lens in a mount

Thermo-mechanical analyses on lens components

Experimental test case measured by CSL

Temperature Distribution

Stress Deformation

Fixed

Fixed


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Complete opto-thermo-mechanical analyses

Pre-Stresses Heating Deformation Change of refractive index Optical performances fully analyzed in ZEMAX updated model

Deformation

Axial refractive

index gradient

Spot

diagram

Wavefront

error


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BEM Electrostatic example using FMM

Electrostatically actuated micro-lens for biomedical application (With courtesy of University of British of Columbia and British Columbia Cancer Research

Centre, CANADA)


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MOEMS

Another example of micro-mirror simulation


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Micro-Projector Modeling & Optimization


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Flexible mirror with piezoelectric actuators

Zernike coefficients automatically

exported to ZEMAX

Piezoelectric actuation simulated in OOFELIE


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Modelling the Position Control of a Segment of the E-ELT using

OOFELIE::Multiphysics Integrated FEM-based Approach,

Ph. Nachtergaele, L. Gamonal, O. Brüls, ACTUATOR 2012 (Messe Bremen)

E-ELT’s primary mirror

(With courtesy of ESO)

One segment modeling & control laws

Deformation due to the excitation of one actuator

Meshed model


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Key features…


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OOFELIE Key Differentiators

Faster convergence and shorter simulation times through full strong coupled simulations between all physical phenomena.

Engineering standard, intuitive, time-saving design flow including scripting parameterization and optimization.

Efficient handling of supersized – Complex problems using coupled FEM, BEM (and FMM) simulation.

1 2 3 4 5

1 metre 0!

1 µ mètre

1min

0.001s

Micro scale Device Key Differentiator


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Structural model in OOFELIE Optical model in ZEMAX

Compatibility of structural & optical models

Sag correction process Ensuring Compatibility

High precision complex shape surfaces with no loss of accuracy due

to CAD file transfers


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Various Physical Couplings

Type of result selection

Physical field & coupling selection


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Easy-to-use interface (SAMCEF Field)

Simple data assignation

Optical indicators retrieved from

ZEMAX

Result selection and viewing


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Several exportation hypotheses

Accounting for transverse nodal displacements

Initial surface types in ZEMAX: Standard surfaces

Even Aspheric surfaces

Describing surface deformation as: Grid Sag

Zernike Standard Sag or Zernike Fringe Sag

Surface deformation exportation to ZEMAX

Standard equation Even aspheric

terms

Zernike

polynomials

,)1(11 1

8

1

2

22

2L

rrr

i

i

i ZArrck

crz


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Rigid Body Motion recognition & separation (optional)

Surface deformation exportation to ZEMAX

Complete deformation

Elastic deformation

(without RBM)


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GRIN: Gradient of Refractive INdex

Axial gradient Radial gradient

Temperature gradient refractive index gradient


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Exporting surface deformation and GRIN simultaneously with the “OOZerGrin” dll file

GRIN automated exportation to ZEMAX


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MOLDEX 3D Molding warpage and bulk optical properties

OOFELIE Data retrieval and

automated communication with ZEMAX

ZEMAX Lens design and

optimization

Plastic Optics: Molding simulation

Residual stresses Birefringence


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Heating defined from a ZEMAX irradiance map

Irradiance map from ZEMAX imported in

OOFELIE surface heat

flux

Temperature

Deformation


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Multiphysical analyses

Finite Element Method & Optical Design Software

Multiphysical modeling

Structural

Thermal Electro-

kinetics

Optical

analyses Wavefront aberration,

Modulation transfer function, ...

Conduction,

convection,

radiation

Electrostatic,

electromagnetism

Temperature Piezoelectric

Stress,

deformation,

vibration

Interface program

Structural

optimization

Surface deformation,

Stress-birefringence,

Refractive index gradient


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Erwin De Baetselier Business Development Manager

Philippe Saint-Georges Optical Engineer

Jean-François JAMOYE Project Manager

Christian Barbier Head of Signal Laboratory

Industrial Multiphysics design for optical devices

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Open Engineering: Strongly Coupled Multiphysics · Open Engineering: Strongly Coupled Multiphysics OOFELIE::Multiphysics Multiphyiscs CAE Consulting •Sensors And Actuators ... Experimental