Ultra-Stable Mirror Mounts for LINC-NIRVANA High Resolution Imager are based on Self-clamping PiezoWalk Motors

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An extremely stable motorized mount for initial alignment of two dichroic beam splitters in the instrument was required. The mirrors reflect visible light and transmit the NIR are located close to the pupil plane are very sensitive to tilt and flexure errors which could be introduced to the wave-front sensor.

Tip/Tilt Gimbal mirror mount with integrated PiezoWalk linear motors and E-712 digital motion controller (Image: PI)
Tip/Tilt Gimbal mirror mount with integrated PiezoWalk linear motors and E-712 digital motion controller (Image: PI)

The technical specifications to be met in a very tight operating envelope were as follows:

  • Tip / tilt range around the major axis of the elliptical mirror: ±2
  • Angular resolution <0.5 arcsec
  • Angular position repeatability <1 arcsec
  • Static position stability (elevation 0° to 90°) <20 arc seconds
  • Minimum resonant frequency >110Hz

PI found a solution based on its compact, high stability PiezoWalk linear motor – a tried and proven technology used on many semiconductor and high-energy physics applications in the past.

 

CAD model cut along the Y axis of the stage base (orange part 1), Dichroic mirror (2); inner gimbal (3); outer gimbal (4); Flexural pivot bearing (5); drive X-axis (6); drive Y-axis (7); runner (8) (Image: PI)
CAD model cut along the Y axis of the stage base (orange part 1), Dichroic mirror (2); inner gimbal (3); outer gimbal (4); Flexural pivot bearing (5); drive X-axis (6); drive Y-axis (7); runner (8) (Image: PI)

 

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Read Poster for Details >

 

Video: Multiple PiezoWalk operating modes
Video: Multiple PiezoWalk operating modes

 

> READ more about PI Products in Aero-Space Applications

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About PI

PI (Physik Instrumente) is a leading manufacturer of precision motion control equipment, piezo motors, air bearing stages and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. PI is present worldwide with fifteen subsidiaries, R&D / engineering on 3 continents and total staff of more than 1,000.

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