28 July 2010 Characterization of OCam and CCD220: the fastest and most sensitive camera to date for AO wavefront sensing
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Abstract
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 OPTICON2 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 OCam2, 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. OCam2 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. OCam2 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 OCam2 can be customized to include a microlens exchange mechanism.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Philippe Feautrier, Philippe Feautrier, Jean-Luc Gach, Jean-Luc Gach, Philippe Balard, Philippe Balard, Christian Guillaume, Christian Guillaume, Mark Downing, Mark Downing, Norbert Hubin, Norbert Hubin, Eric Stadler, Eric Stadler, Yves Magnard, Yves Magnard, Michael Skegg, Michael Skegg, Mark Robbins, Mark Robbins, Sandy Denney, Sandy Denney, Wolfgang Suske, Wolfgang Suske, Paul Jorden, Paul Jorden, Patrick Wheeler, Patrick Wheeler, Peter Pool, Peter Pool, Ray Bell, Ray Bell, David Burt, David Burt, Ian Davies, Ian Davies, Javier Reyes, Javier Reyes, Manfred Meyer, Manfred Meyer, Dietrich Baade, Dietrich Baade, Markus Kasper, Markus Kasper, Robin Arsenault, Robin Arsenault, Thierry Fusco, Thierry Fusco, José Javier Diaz-Garcia, José Javier Diaz-Garcia, } "Characterization of OCam and CCD220: the fastest and most sensitive camera to date for AO wavefront sensing", Proc. SPIE 7736, Adaptive Optics Systems II, 77360Z (28 July 2010); doi: 10.1117/12.856401; https://doi.org/10.1117/12.856401
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