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Proceedings Paper

Integration and first results of the CAMCAO NIR camera
Author(s): António Amorim; Jorge Lima; João Alves; José Rebordão; José Pinhão; Luis Gurriana; Alexandre Cabral; Enrico Marchetti; Johann Kolb; Sebastian Tordo; Gert Finger; Jean-Louis Lizon; Filipe Duarte Santos; Rui Ferreira Marques; Rui Alves; Rui Barros
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Paper Abstract

This paper presents the integration and first results for the CAMCAO NIR camera. The camera was built for the ESO Multi-conjugate Adaptive optics Demonstrator, where it is presently operating, to evaluate the feasibility of this Adaptive Optics technique. On a second phase it will work directly at the Nasmyth focus of the VLT. CAMCAO is a high resolution, wide field of view NIR camera, that is using the 2k×2k HgCdTe HAWAII- 2 infrared detector from Rockwell Scientific, controlled by the ESO IRACE system. The camera operates in the near infrared region between 1.0 μm and 2.5 μm wavelength using an eight position filter wheel with J, H, K', K-continuum and Brγ filters. Both the integration experience and the results obtained in the mechanical, vacuum, cryogenics and optical tests are presented, including all relevant parameters in the ESO specifications. The requirement of mechanical stiffness together with light weight was achieved yielding a total weight of less than 90 Kg. The camera fulfills both cryogenic and vacuum stability requirements. The temperature within the detector is maintained at 80K by an accurate control loop, ensuring mK stability, after cooling down the detector at a rate kept below 0.5 K/min. The optical performance tests were made using a Fizeau interferometer both for the individual optical components and complete setup. The infrared optical validation measurements were performed by re-imaging a point source in the camera focal plane and measuring the PSF with the detector. The computed Strehl ratio reached 95% in the central region of the FoV, with values larger than 90% in a area covering 88% of the focal plane.

Paper Details

Date Published: 28 June 2006
PDF: 9 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 626957 (28 June 2006); doi: 10.1117/12.671746
Show Author Affiliations
António Amorim, Univ. de Lisboa (Portugal)
SIM/IDL Instituto Dom Luís (Portugal)
Jorge Lima, Univ. de Lisboa (Portugal)
SIM/IDL Instituto Dom Luís (Portugal)
João Alves, European Southern Observatory (Germany)
José Rebordão, INETI, Aerospace Lab. (Portugal)
José Pinhão, Univ. de Coimbra (Portugal)
Luis Gurriana, Univ. de Lisboa (Portugal)
Alexandre Cabral, INETI, Aerospace Lab. (Portugal)
Enrico Marchetti, European Southern Observatory (Germany)
Johann Kolb, European Southern Observatory (Germany)
Sebastian Tordo, European Southern Observatory (Germany)
Gert Finger, European Southern Observatory (Germany)
Jean-Louis Lizon, European Southern Observatory (Germany)
Filipe Duarte Santos, Univ. de Lisboa (Portugal)
SIM/IDL Instituto Dom Luís (Portugal)
Rui Ferreira Marques, Univ. de Coimbra (Portugal)
Rui Alves, Univ. de Coimbra (Portugal)
Rui Barros, Univ. de Lisboa (Portugal)

Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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