Adaptive Optics; Calibration; Real-Time Computing; Wavefront Control
Abstract :
[en] METIS, the Mid-Infrared ELT Imager and Spectrograph is a first-generation ELT instrument scheduled to see first light in 2029. Its two main science modules are supported by an adaptive optics system featuring a pyramid sensor with 90x90 sub-apertures working in H- and K-band. The wavefront control concept for METIS’ single-conjugate adaptive optics relies on a synthetic calibration that uses a model of the telescope and instrument to generate the interaction and control matrices, as well as the final projection on a modal command vector. This concept is enforced owing to the absence of a calibration source in front of the ELT’s main deformable mirror. The core of the synthetic calibration functionality is the Command Matrix Optimiser module, which consists of several components providing models for various parts and aspects of the instrument, as well as the entire reconstructor. Many are present in the simulation environment used during the design phases, but need to be re-written and/or adapted for real-life use. In this paper, we present the design of the full command matrix optimisation module, the status of these efforts and the overall final concept of METIS’ soft real-time system.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Steuer, Horst; Max Planck Institute for Astronomy, Heidelberg, Germany
Feldt, Markus; Max Planck Institute for Astronomy, Heidelberg, Germany
Bertram, Thomas; Max Planck Institute for Astronomy, Heidelberg, Germany
Correia, Carlos M.; Universidade do Porto, Departamento de Engenharia Fisica, Porto, Portugal
Obereder, Andreas; MathConsult GmbH, Linz, Austria
Coppejans, Hugo; Max Planck Institute for Astronomy, Heidelberg, Germany
Kulas, Martin; Max Planck Institute for Astronomy, Heidelberg, Germany
Scheithauer, Silvia; Max Planck Institute for Astronomy, Heidelberg, Germany
Vazquez, M. Concepción Cardenas; Max Planck Institute for Astronomy, Heidelberg, Germany
Mortimer, Daniel; Max Planck Institute for Astronomy, Heidelberg, Germany
Orban De Xivry, Gilles ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Language :
English
Title :
Evolving the METIS soft real-time control system out of the simulation environment
ERC - European Research Council F.R.S.-FNRS - Fonds de la Recherche Scientifique EU - European Union
Commentary :
Copyright 2024 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
Cayrel, M., “E-ELT optomechanics: overview,” in [Ground-based and Airborne Telescopes IV], Stepp, L. M., Gilmozzi, R., and Hall, H. J., eds., 8444, 84441X, International Society for Optics and Photonics, SPIE (2012).
Gratadour, D., Puech, M., Vérinaud, C., Kestener, P., Gray, M., Petit, C., Brulé, J., Clénet, Y., Ferreira, F., Gendron, E., et al., “COMPASS: an efficient, scalable and versatile numerical platform for the development of ELT AO systems,” in [Adaptive Optics Systems IV], 9148, 2173–2180, SPIE (2014).
Correia, C. M., Feldt, M., Steuer, H., Shatokhina, J., Obereder, A., Neureuther, P., Kulas, M., Coppejans, H., de Xivry, G. O., Scheithauer, S., et al., “Elt metis wavefront control strategy,” in [Adaptive Optics Systems VIII], 12185, 311–324, SPIE (2022).
Kulas, M., Hugo, C., Steuer, H., Bertram, T., Correia, C., Philip, N., and Briegel, F., “The RTC for METIS SCAO,” in [Adaptive Optics for Extremely Large Telescopes 7th Edition], (2023).
Kulas, M., Steuer, H., Coppejans, H., Bertram, T., Briegel, F., Naranjo, V., Feldt, Markus Correia, C., Obereder, A., Absil, O., Orban de Xivry, G., and De Meester, W., “The METIS AO Control System at the beginning of MAIT,” in [Adaptive Optics Systems IX], Proc. SPIE (2024).
Obereder, A., Bertram, T., Correia, C., Feldt, M., Raffetseder, S., Steuer, H., and Stadler, B., “On how to gain 60nm RMS (for the instrument METIS) in AO control,” in [Adaptive Optics Systems IX], Proc. SPIE (2024).
Correia, C., Steuer, H., Feldt, M., Obereder, A., Kulas, M., Coppejans, H., Orban de Xivry, G., Absil, O., and Bertram, T., “Handing over from the ELT: online METIS mis-registration calibration with crazy fast control matrix updates,” in [Adaptive Optics Systems IX], Proc. SPIE (2024).
Correia, C. M., Feldt, M., Steuer, H., Shatokhina, J., Obereder, A., Neureuther, P., Kulas, M., Coppejans, H., Orban de Xivry, G., Scheithauer, S., and Bertram, T., “ELT METIS wavefront control strategy,” Proc. SPIE 12185 (2022).
Herbst, T., Ragazzoni, R., Andersen, D., Boehnhardt, H., Bizenberger, P., Eckart, A., Gässler, W., Rix, H.-W., Rohloff, R.-R., Salinari, P., Soci, R., Straubmeier, C., and Xu, W., “LINC-NIRVANA: a Fizeau beam combiner for the Large Binocular Telescope,” in [Interferometry for Optical Astronomy II], Traub, W. A., ed., 4838, 456 – 465, International Society for Optics and Photonics, SPIE (2003).
Herbst, T. M., Bertram, T., Arcidiacono, C., Bergomi, M., Berwein, J., Bizenberger, P., Briegel, F., Farinato, J., Klettke, M., Marafatto, L., Mathar, R., McGurk, R., Ragazzoni, R., Santhakumari, K. K. R., and Viotto, V., “Installation and commissioning of the LINC-NIRVANA near-infrared MCAO imager on LBT,” in [Ground-based and Airborne Instrumentation for Astronomy VII], Evans, C. J., Simard, L., and Takami, H., eds., Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 10702, 107020U (July 2018).
