Animation of the In-Air Galvano Gimbaled Mirror which is designed for the Virgo experiment at the European Gravitational Observator near Pisa. 20 assemblies will be delivered by Nikhef. They will be used in a control loop to keep a beam centered on a quadrant Photo-diode.
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1 Fused Silica Mirror Ø 1" x 6mm
2 Aluminium 3D printed (@ Oceanz.eu) Gimbals with a wall thickness of 0.5mm
4 Flexure Pivot Bearings with a torsional spring rate of 1,67 Nmm/°
4 Neodymium Magnets
4 Copper Voice Coils with 600 windings and wire Ø 0.25mm
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Max Rotation ± 2 deg
Max frequency ~ 5 Hz
Resonances are ~ 26Hz (H) and 30Hz (V)
Mirror can be glued from the back
Voice Coil Mirror Driver PCB also developed at Nikhef