| Autor: |
Mark Stanford Robbins, Michael Skegg, Peter J. Pool, Patrick Wheeler, Markus Kasper, Mark Downing, Ray Bell, Robin Arsenault, Sandy Denney, Manfred Meyer, Javier Reyes, David W. Burt, Paul Jorden, Eric Stadler, Yves Magnard, Christian Guillaume, Philippe Balard, Philippe Feautrier, Norbert Hubin, Dietrich Baade, Jean-Luc Gach, Thierry Fusco, Jose J. Diaz-Garcia, Ian R. L. Davies, Wolfgang Suske |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
SPIE Proceedings. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.856401 |
| Popis: |
For the first time, sub-electron read noise has been achieved with a camera suitable for astronomical wavefront-sensing (WFS) applications. The OCam system has demonstrated this performance at 1300 Hz frame rate and with 240×240-pixel frame rate. ESO and JRA2 OPTICON 2 have 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 240×240 pixel frame-transfer 8-output back-illuminated sensor using the EMCCD technology. This paper demonstrates sub-electron read noise at frame rates from 25 Hz to 1300 Hz and dark current lower than 0.01 e-/pixel/frame. It reports on the comprehensive, quantitative performance characterization of OCam and the CCD220 such as readout noise, dark current, multiplication gain, quantum efficiency, 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 , was designed offering enhanced performances, a completely sealed camera package and an additional Peltier stage to facilitate operation on a telescope or environmentally rugged applications. OCam 2 offers two types of built-in data link to the Real Time Computer: the CameraLink industry standard interface and various fiber link options like the sFPDP interface. OCam 2 includes also a modified mechanical design to ease the integration of microlens arrays for use of this camera in all types of wavefront sensing AO system. The front cover of OCam 2 can be customized to include a microlens exchange mechanism. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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