OCam with CCD220, the Fastest and Most Sensitive Camera to Date for AO Wavefront Sensing
| Autor: | Christian Guillaume, Eric Stadler, Ian R. L. Davies, Manfred Meyer, Thierry Fusco, Yves Magnard, Mark Downing, Wolfgang Suske, José Javier Díaz García, Patrick Wheeler, Michael Skegg, Javier Reyes, David W. Burt, Mark Stanford Robbins, Philippe Feautrier, Robin Arsenault, Peter J. Pool, Markus Kasper, Ray Bell, Norbert Hubin, Dietrich Baade, Paul Jorden, Philippe Balard, Sandy Denney, Jean-Luc Gach |
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| Přispěvatelé: | Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Physics
Wavefront Pixel [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] Preamplifier business.industry Frame (networking) Astronomy and Astrophysics Frame rate 01 natural sciences 7. Clean energy Noise (electronics) 010309 optics Optics Space and Planetary Science 0103 physical sciences Adaptive optics business 010303 astronomy & astrophysics Dark current |
| Zdroj: | Publications of the Astronomical Society of the Pacific Publications of the Astronomical Society of the Pacific, 2011, 123 (901), pp.263--274. ⟨10.1086/658879⟩ Publications of the Astronomical Society of the Pacific, Astronomical Society of the Pacific, 2011, 123 (901), pp.263--274. ⟨10.1086/658879⟩ |
| ISSN: | 0004-6280 1538-3873 |
| DOI: | 10.1086/658879⟩ |
| Popis: | International audience; For the first time, subelectron readout noise has been achieved with a camera dedicated to astronomical wavefront-sensing applications. The OCam system demonstrated this performance at a 1300 Hz frame rate and with 240 x 240 pixel frame size. ESO and JRA2 OPTICON jointly funded e2v Technologies to develop a custom CCD for adaptive optics (AO) wavefront-sensing applications. The device, called CCD220, is a compact Peltier-cooled 240 x 240 pixel frame-transfer eight-output back-illuminated sensor using the EMCCD technology. This article demonstrates, for the first time, subelectron readout noise at frame rates from 25 Hz to 1300 Hz and dark current lower than 0.01 e(-) pixel(-1) frame(-1). It reports on the quantitative performance characterization of OCam and the CCD220, including readout noise, dark current, multiplication gain, quantum efficiency, and charge transfer efficiency. OCam includes a low-noise preamplifier stage, a digital board to generate the clocks, and a microcontroller. The data acquisition system includes a user-friendly timer file editor to generate any type of clocking scheme. A second version of OCam, called OCam(2), has been designed to offer enhanced performance, a completely sealed camera package, and an additional Peltier stage to facilitate operation on a telescope or environmentally challenging applications. New features of OCam(2) are presented in this article. This instrumental development will strongly impact the performance of the most advanced AO systems to come. |
| Databáze: | OpenAIRE |
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