The MICADO first light imager for ELT: derotator design status and prototype results

Barboza, Santiago; Pott, Jörg-Uwe; Rohloff, Ralf-Rainer; Müller, Friedrich; Hofferbert, R.; Münch, Norbert; Mohr, Lars; Ramos, J.; Ebert, M.; Glück, Martin; Wagner, Jörg; Kärcher, Hans; Schlossmacher, Wolfram; Häberle, Maximilian

doi:10.1117/12.2311683

Cited by 6 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Differently from MAORY and the ELT, the whole MICADO instrument is part of the NCPAs, the WFE of which is not sensed by the MCAO WFS and therefore not compensated for. Any change, degradation, or distortion occurring into the cryostat is essentially uncorrectable by the AO system, posing important requirements on the derotation accuracy, 34 the optics stability and quality, and the rotation precision of the atmospheric dispersion compensator (ADC). 35 Since the AO correction cannot reach this system, we do not analyze its distortions.…”

Section: Low-order Distortions and Plate Scale Driftsmentioning

confidence: 99%

Performance and limitations of using ELT and MCAO for 50 μas astrometry

Rodeghiero

Arcidiacono

Pott

et al. 2021

J. Astron. Telesc. Instrum. Syst.

Self Cite

View full text Add to dashboard Cite

Multi-conjugated adaptive optics (MCAO) is essential for performing astrometry with the Extremely Large Telescope (ELT). Unlike most of the 8-m class telescopes, the ELT will be a fully adaptive telescope, and a significant portion of the adaptive optics (AO) dynamic range will be depleted by the correction and stabilization of the telescope aberrations and instabilities. MCAO systems are of particular interest for ground-based astrometry since they stabilize the low-order field distortions and transient plate scale instabilities, which originate from the telescope and in the instrument. All instruments have several optical elements relatively far away from the pupil that can potentially challenge the astrometric precision of the observations with their residual mid-spatial frequencies errors. Using a combined simulation of ray tracing and AO numerical codes, we assess the impact of these systematic errors at different field-ofview (FoV) scales and fitting scenarios. The distortions have been assessed at different sky position angles (PA) and indicate that over large FoVs only small PA ranges (AE1 deg to 3 deg) are accessible with astrometric residuals ≤50 μas. A full compliance with the astrometric requirement, at any PA, is achievable for 2 arc sec 2 FoV patches already with a third-order polynomial. The natural partition of the optical system into three segments, i.e., the ELT, the MAORY MCAO module, and the MICADO instrument, resembles a splitting of the astrometric problem into the three subsystems that are characterized by different distortion amplitudes and calibration strategies. The result is a family portrait of the different optical segments with their specifications, dynamic motions, conjugation height, and AO correctability, leading to tracing their role in the bigger puzzle of the 50-μas as astrometric endeavor. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

show abstract

Section: Low-order Distortions and Plate Scale Driftsmentioning

confidence: 99%

Performance and limitations of using ELT and MCAO for 50 μas astrometry

Rodeghiero

Arcidiacono

Pott

et al. 2021

J. Astron. Telesc. Instrum. Syst.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The image derotation is designed to achieve the same over the MICADO field. Achieving a 0.5mas centroid stability over a 50arcsec diameter field translates into an image derotation precision of 2arcsec during the integration (4,6) .…”

Section: Instrumental Linear-term Controlmentioning

confidence: 99%

The MICADO first light imager for ELT: its astrometric performance

Pott

Rodeghiero

Riechert

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

Self Cite

View full text Add to dashboard Cite

We report on our ongoing efforts to ensure that the MICADO NIR imager reaches differential absolute (often abbreviated: relative) astrometric performance limited by the SNR of typical observations. The exceptional 39m diameter collecting area in combination with a powerful multi-conjugate adaptive optics system (called MAORY) brings the nominal centroiding error, which scales as FWHM/SNR, down to a few 10 µas. Here we show that an exceptional effort is needed to provide a system which delivers adequate and calibrateable astrometric performance over the full field of view (up to 53 arcsec diameter).

show abstract

Dual-Motor Drive Image Stabilization System for Elevation-Azimuth Photoelectric Survey Telescope Under Long Exposure

Li,

Yang

et al. 2024

IEEE/ASME Trans. Mechatron.

View full text Add to dashboard Cite

The MICADO first light imager for ELT: derotator design status and prototype results

Cited by 6 publications

References 4 publications

Performance and limitations of using ELT and MCAO for 50 μas astrometry

Performance and limitations of using ELT and MCAO for 50 μas astrometry

The MICADO first light imager for ELT: its astrometric performance

Dual-Motor Drive Image Stabilization System for Elevation-Azimuth Photoelectric Survey Telescope Under Long Exposure

Contact Info

Product

Resources

About