Mécanismes piézo

Piezo mechanisms are based on at least one piezo actuator and on additional functions:

  • A piezoelectric mechanism can be based on only one actuator which takes care of some other degrees of freedom by guiding mechanisms. For example the Optical Phase Difference Actuator (OPDA), a space-qualified linear piezo stage developed for Oerlikon-Contraves Space into the LISA mission presented hereafter, is based on one APA®; and on an elastic guiding.
  • A piezoelectric mechanism can be based on several actuators offering a complementary role. For example in CEDRAT TECHNOLOGIES' XY piezo stages, the piezo actuators of the Y axis provide motion guidance of the X axis actuators and vice-versa.

Most of CEDRAT TECHNOLOGIES' piezoelectric mechanisms are based on standard or customised Amplified Piezoelectric Actuators (APA®) or Parallel Pre-stress Actuators (PPAs). They allow the realisation of X and XY stages, tip-tilts, hollow actuators, shutters and 5 or 6 degrees of freedom precision mechanisms.

CEDRAT TECHNOLOGIES' piezo mechanisms benefit from a large aerospace heritage, which itself results from the design choices towards a high reliability and a high energy density: CEDRAT TECHNOLOGIES' piezoelectric actuators are highly pre-stressed and do not include weak points (as hertzian pivot or flexural hinges). This provides several advantages : a very good ability to withstand external loads (as external vibrations), high dynamics (capability in a large bandwidth from Dc to above resonance) and a long life time.

CEDRAT TECHNOLOGIES' monolithic (solid state) piezo mechanisms combine one or several actuators and guidance in one single part, as in the XY stages. This provides additional benefits in terms of compactness, cost and reliability.  

The following examples show various prototypes and customised products. Other examples can be found in the mechatronic systems section and among the related publications.

Double tip tilt DTT300ML-SG-SV

Description

Fast steering mirror FSM for SiC large aperture mirror with its controller rack.

Applications

High power laser, line of sight stabilisation for atmospheric disturbance compensation.

Status
Prototype
DTT300ML

Double tip tilt DTT120ML-PTW for MEFISTO

Description

In the context of CNES future observation satellite and DGA funding, and in collaboration with CNES and SODERN, CTEC designed a large space mechanism.

Applications

The MEFISTO mechanism is dedicated to fillet compensation for space telescopes.

Status
Space qualified prototype
DTT120ML

Double tip tilt DTT95ML-SG-SV

Description

Fast steering mirror FSM with 120 mm diameter SiC mirror.

Applications

Space, point-ahead mechanism for infrared telescope.

Status
Space qualified prototype
DTT95ML

Double tip tilt DTT60S-SG for ATLID

Description

Thanks to the heritage from the PHARAO DTT, CTEC has developed the ATLID Beam Steering Mechanism (BSM).

Applications

Space

Status
Space qualified prototype
DTT60S-SG

Double tip tilt DTT40SM-SG FSM

Description

Fast steering mirror FSM for 80 mm diameter mirror.

Applications

High power laser, atmospheric disturbance compensation.

Status
Prototype
DTT40SM

Double Tip Tilt DTT35XS-SG-SV

Description

Fast steering mirror FSM for 50 mm diameter mirror with CCBu20 controller box.

Applications

Line of sight stabilisation.

Status
Prototype
DTT35XS

Double Tip Tilt DTT15XS-SG FSM

Description

Compact fast steering mirror FSM with its controller box for embedded electro optic systems.

Applications

Image stabilisation and micro-scan combined in a single unit (5th and 6th axis of gyro stabilised platform).

Status
Prototype
DTT15XS

Cryogenic Double tip tilt DTT10h for ESA CFSM project

Description

For the ESA EChO mission, the use of a fine steering tip and tilt mechanism ensures the stability of the line of sight for a telescope operating in cryogenic conditions. 

Applications

Space, pointing

Status
Prototype
DTT10H cryogenic mechanism

Double tip tilt DTT10M-SG-SV FSM for high power laser

Description

Fast steering mirror FSM for 50 mm diameter mirror with its controller rack.

Applications

High power Laser, atmospheric disturbance compensation.

Status
Space evaluated
DTT10M

Double Tilt Translator: DTT35XS

Description

DTT35XS-space is a very light piezoelectric tip-tilt mechanism designed according to ECSS space rules for Pharao mission and delivered to EADS.

Applications

Instrumentation, Optics etc.

Status
Product

Piezo actuators for astronomical instrumentation

Description

In astronomical instrumentation, the trend is currently to build up large telescopes. Such structures enable to gather more light and hence, to see our universe brighter. Numerous projects like VLT, ELT,TMT … are well known cases showing the tendency.

Applications

Space mechanism, instrumentation etc.

Status
Concept

Fast Piezo Shutters: FPS200M, FPS400M & FPS900M

Description

The fast piezoelectric shutter FPS is made to shutting off X-Ray beams. It is based on compact dynamic and precise APA® piezo actuators. Smaller or larger aperture (>1mm) shutters are proposed.

Applications

Crystallography, Optical shutter, beam shutter etc.

Status
Product

XY Piezoelectric stage: XY200M

Description

The XY200M stage has been designed thanks to CNES complying with ECSS space rules. It is a monolythic piezo mechanism using the qualified APA® technology.

Applications

Aerospace, Scanning, High positioning accuracy etc.

Status
Space evaluated

Piezo stage for optical delay line: OPDA

Description

OPDA is an outstanding example of accurate mechanisms for instrumentation in a harsh environment. This X stage has been delivered to Oerlikon Contraves for LISA mission.

Applications

Optical Delay Line, Space mechanism, Intrumentation etc.

Status
Space qualified prototype