LISA-Pathfinder

The LISA Technology Package on board of LISA PATHFINDER will enable testing of followingLISA key technologies:'Inertial Sensor': to demonstrate that the test masses are really flying free of all external influences and to detect changes in the position and orientation of the satellite relative to the proof mass; 'disturbance-free flight control': multiple sets of thrusters at µ-Newton levels (not part of LTP) will be used to control the spacecraft position to a few microns. The thrusters are to counteract the changes in position and orientation of the spacecraft due to external forces in order to keep it centred on the proof mass. This will also include test of the algorithms of the system control.‘laser interferometer': to measure the absolute position and attitude and the difference in the displacement of the two proof masses to validate that each is 'disturbance-free' within the requirements.

Masse de l'engin spatial Science : 480 kgModule de propulsion, carburant inclus : 420 kgMasse totale au lancement : 1900 kgDimensions : 2,9 m de haut pour 2,1 m de diamètreDate de lancement : Mi-2008

Masse

Masse

laser interferometer

LaserF

F

F-

Frequence = f

Detector

Acousto-Optical-Modulator

Splitter

€

Vs(t) =Vs,0 cos(Ωt + φ) Sans f

€

F + Ω et F

€

φt = φ0 +2π

λ laser2∂A0 cos(i)cos(2πft) Phase du au

Mouvement du miroir

€

∂A0 << λ Laser

W-f +f

F

F

F

FF+

F-

Ordre 0

Ordre 0

Ordre 1

Ordre 1

QuickTime™ et undécompresseur TIFF (LZW)

sont requis pour visionner cette image.

QuickTime™ et undécompresseur TIFF (LZW)

sont requis pour visionner cette image.

Modèle de vol Nd:YAG 25 mw 1064 nm --> LISA

Ecole Normale Supérieure

Pharao.

-Design of 15 AOM(Oxyde de Tellure)

-Prototype AOM for Lisa-Pathfinder.

Laser unit

Laser-AOM électronique

AOM withRF amplitude control

178 cm

212 cm