28 June 2006 Integration and first results of the CAMCAO NIR camera
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
António Amorim, António Amorim, Jorge Lima, Jorge Lima, João Alves, João Alves, José Rebordão, José Rebordão, José Pinhão, José Pinhão, Luis Gurriana, Luis Gurriana, Alexandre Cabral, Alexandre Cabral, Enrico Marchetti, Enrico Marchetti, Johann Kolb, Johann Kolb, Sebastian Tordo, Sebastian Tordo, Gert Finger, Gert Finger, Jean-Louis Lizon, Jean-Louis Lizon, Filipe Duarte Santos, Filipe Duarte Santos, Rui Ferreira Marques, Rui Ferreira Marques, Rui Alves, Rui Alves, Rui Barros, Rui Barros, } "Integration and first results of the CAMCAO NIR camera", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 626957 (28 June 2006); doi: 10.1117/12.671746; https://doi.org/10.1117/12.671746


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