Design of the near infrared camera DIRAC for East Anatolia Observatory
Yükleniyor...
Tarih
2022
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
SPIE
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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.
Açıklama
Anahtar Kelimeler
Infrared, Camera, Diffraction limited, Cryogenic, Wavefront budget, Cryostat, Adaptive optics, Budget control, Focusing, Observatories, Telescopes, Temperature indicating cameras, Wheels, Anatolia, Filter wheel, Focal plane, Focal-plane arrays, Near infrared cameras, Performance specifications, Refractive design, Wavelength ranges, Infrared devices
Kaynak
Ground-Based And Airborne Instrumentation For Astronomy IX
WoS Q Değeri
N/A
Scopus Q Değeri
N/A
Cilt
12184
Sayı
Künye
Zhelem, R., Content, R., Churilov, V., Kripak, Y., Waller, L., Case, S., Mali, S., Muller, R., Gonzalez, M., Adams, D., Binos, N., Chin, T., Farrell, T., Klauser, U., Kondrat, Y., Kunwar, N., Lawrence, J., Lorente, N., Luo, S., McDonald, E., McGregor, H., Nichani, V., Pai, N., Vuong, M., Zahoor, J., Zheng, J., Norris, B., Bryant, J., Vaccarella, A., Herrald, N., Gilbert, J., Yeşilyaprak, C., Güçsav, B., Coker, D., Keskin, O. & Jolissaint, L. (2022). Design of the near infrared camera DIRAC for East Anatolia Observatory. Paper presented at the Ground-Based And Airborne Instrumentation For Astronomy IX, 12184. doi:10.1117/12.2629716
