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Design of the near infrared camera DIRAC for East Anatolia Observatory
Zhelem, Ross; Content, Robert; Churilov, Vladimir; Kripak, Yevgen; Waller, Lew; Case, Scott; Mali, Slavko; Muller, Rolf; Gonzalez, Mario; Adams, Dave; Binos, Nick; Chin, Timothy; Farrell, Tony; Klauser, Urs; Kondrat, Yuriy; Kunwar, Nirmala; Lawrence, Jon; Lorente, Nuria; Luo, Summer; McDonald, Erica; McGregor, Helen; Nichani, Vijay; Pai, Naveen; Vuong, Minh; Zahoor, Jahanzeb; Zheng, Jessica; Norris, Barnaby; Bryant, julia; Vaccarella, Annino; Herrald, Nick; Gilbert, James; Yesilyaprak, Cahit; Gucsav, Bulent; Coker, Deniz; Keskin, Onur; Jolissaint, Laurent
2022
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Résumé

The 4m DAG telescope is under construction at East Anatolia Observatory in Turkey. DIRAC, the “DAG InfraRed Adaptive optics Camera”, is one of the facility instruments. This paper describes the design of the camera to meet the performance specifications. Adaptive and auxiliary optics relay the telescope F/14 input 1:1 into DIRAC. The camera has an all refractive design for the wavelength range 0.9 - 2.4 micron. Lenses reimage the telescope focal plane 33 x 33 as (9 x 9 mm) on a 1k x 1k focal plane array. With magnification of 2x, the plate scale on the detector is 33 mas/pixel. There are 4 standard filters (Y, J, H, K) and 4 narrowband continuum filters. A 12 position filter wheel allows installation of 2 extra customer filters for specific needs; the filter wheel also deploys a pupil viewer lens. Optical tolerancing is carried out to deliver the required image quality at polychromatic Strehl ratio of 90% with focus compensator. This reveals some challenges in the precision assembly of optics for cryogenic environments. We require cells capable of maintaining precision alignment and keeping lenses stress free. The goal is achieved by a combination of flexures with special bonding epoxy matching closely the CTE of the lens cells and crystalline materials. The camera design is very compact with object to image distance <220 mm and lens diameters <25 mm. A standalone cryostat is LN2 cooled for vibration free operation with the bench mounted adaptive optics module (TROIA) and coronagraph (PLACID) at the Nasmyth focus of the DAG telescope.

Détails

Titre
Design of the near infrared camera DIRAC for East Anatolia Observatory
Auteur(s)/ trice(s)
Zhelem, Ross (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Content, Robert (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Churilov, Vladimir (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Kripak, Yevgen (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Waller, Lew (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Case, Scott (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Mali, Slavko (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Muller, Rolf (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Gonzalez, Mario (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Adams, Dave (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Binos, Nick (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Chin, Timothy (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Farrell, Tony (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Klauser, Urs (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Kondrat, Yuriy (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Kunwar, Nirmala (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Lawrence, Jon (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Lorente, Nuria (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Luo, Summer (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
McDonald, Erica (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
McGregor, Helen (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Nichani, Vijay (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Pai, Naveen (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Vuong, Minh (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Zahoor, Jahanzeb (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Zheng, Jessica (Macquarie University, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Norris, Barnaby (The University of Sydney, Sydney, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Bryant, julia (The University of Sydney, Sydney, NSW, Australia ; Astralis Instrumentation Consortium, Australia)
Vaccarella, Annino (Mount Stromlo Observatory, Weston Creek, ACT, Australia ; Astralis Instrumentation Consortium, Australia)
Herrald, Nick (Mount Stromlo Observatory, Weston Creek, ACT, Australia ; Astralis Instrumentation Consortium, Australia)
Gilbert, James (Mount Stromlo Observatory, Weston Creek, ACT, Australia ; Astralis Instrumentation Consortium, Australia)
Yesilyaprak, Cahit (Ataturk University, Erzurum, Turkey)
Gucsav, Bulent (Ataturk University, Erzurum, Turkey)
Coker, Deniz (Ataturk University, Erzurum, Turkey)
Keskin, Onur (FMV Isik University, Istanbul, Turkey)
Jolissaint, Laurent (School of Engineering and Management Vaud, HES-SO, University of Applied Sciences and Arts Western Switzerland)
Date
2022-07
Publié dans
Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 1218440 SPIE Astronomical Telescopes + Instrumentation
Volume
2022, vol. 12184
Publié par
Montréal, QC, Canada, 17-23 July 2022
Pagination & équivalents
12 p.
Présenté à
Ground-based and Airborne Instrumentation for Astronomy IX, Montréal, QC, Canada, 2022-07-17, 2022-07-23
ISBN
9781510653498
DOI
https://doi.org/10.1117/12.2629716
Mots-clés (libres)
infrared ; camera ; diffraction limited ; cryogenic ; wavefront budget ; cryostat
Type de papier
published full paper
Domaine
Ingénierie et Architecture
Ecole
HEIG-VD
Institut
iAi-Institut d'Automatisation Industrielle
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