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- W2094801401 abstract "The Mid-infrared E-ELT Imager and Spectrograph, or METIS, is foreseen as the third instrument for the EuropeanExtremely Large Telescope (E-ELT). A key part of METIS is the Cold Chopper (MCC) which switches the optical beambetween the target and a nearby reference sky during observation for elimination of the fluctuating IR background signalin post-processing. This paper discusses the development of the MCC demonstrator.The chopper mirror (O64mm) has to tip/tilt in 2D with a combined angle of up to 13.6mrad with 1.7μrad stability andrepeatability within 5ms (95% duty cycle at 5Hz) at 80K. As these requirements cannot be met in the presence of frictionor backlash, the mirror is guided by a monolithically integrated flexure mechanism. The angular position is actuated bythree linear actuators and measured by three linear position sensors, resulting in a fast tip, tilt, and focus mirror. Usingthe third actuator to introduce symmetry, homogeneity in forces and heat flux is obtained.Both the actuators and the sensors are key components. A voice coil actuator had to be custom designed, to achieve therequired acceleration force within the specified 1W heat load. The requirements for the displacement measurement canbe met with a commercially available, fiber interferometry system. For integration of this system, stray light eliminationis a critical design aspect and retro-reflectors have been used to reflect sufficient power into the fiber at large tip/tiltangles." @default.
- W2094801401 created "2016-06-24" @default.
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- W2094801401 date "2012-09-13" @default.
- W2094801401 modified "2023-10-05" @default.
- W2094801401 title "Development of a 2D precision cryogenic chopper for METIS" @default.
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- W2094801401 doi "https://doi.org/10.1117/12.925338" @default.
- W2094801401 hasPublicationYear "2012" @default.
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