English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
Add to Basket
 Local TagsRelease HistoryDetailsSummary
  The MICADO first light imager for ELT: control concept for the derotator

Glück, M., Barboza, S., Mohr, L., Ramos, J., Pott, J.-U., & Sawodny, O. (2018). The MICADO first light imager for ELT: control concept for the derotator.

Item is

 

show all hide all

Basic

show hide
Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CD94-D Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CD95-C
Genre: Proceedings

Files

show Files

Locators

show
hide
Locator:
https://ui.adsabs.harvard.edu/abs/2018SPIE10702E..94G (Any fulltext)
Description:
-
OA-Status:

Creators

show
hide
 Creators:
Glück, Martin1, Author
Barboza, Santiago1, Author
Mohr, Lars1, Author
Ramos, Jose1, Author
Pott, Jörg-Uwe1, Author
Sawodny, Oliver1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

Content

show
hide
Free keywords: -
 Abstract: The Multi-AO Imaging Camera for Deep Observations (MICADO) is one of the three first light instruments of the Extremely Large Telescope (ELT). Based on the Multi Conjugate Adaptive Optics (MCAO) modul MAORY MICADO offers diffraction-limited near-infrared imagery with a maximum field of view of 53 arcsec. In order to maintain diffraction-limited performance at the edge of the field, a precise image derotator is needed, which compensates the field rotation due to alt-azimuth mount of the telescope. In MICADO a four-point contact ball bearing is foreseen to rotate the cryostat for the compensation of the field rotation. Due to the heavy load and the high precision positioning of the ball bearing a control concept for the derotator is needed. The main challenge of positioning the ball bearing is the handling of friction effects. In this paper we present a control concept based on a velocity feedforward and a PID feedback control to rotate the bearing in the required position performance. At a scaled-down laboratory setup we demonstrate the position accuracy. To further improve the position accuracy we also study an additional friction compensation, which is based on a dynamical friction model.

Details

show
hide
Language(s):
 Dates: 2018
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISBN: 9781510619579
 Degree: -

Event

show
hide
Title: Ground-based and Airborne Instrumentation for Astronomy VII
Place of Event: -
Start-/End Date: 2018

Legal Case

show

Project information

show

Source

show