Optically sensitive Medipix2 detector for adaptive optics wavefront sensing
Optically sensitive Medipix2 detector for adaptive optics wavefront sensing
复制标题
用于自适应光学波前传感的光敏 Medipix2 探测器
DOI：
10.1016/j.nima.2005.03.102
复制
发表时间：
2005
影响因子：
1.4
通讯作者：
A. Clark
中科院分区：
文献类型：
--
作者：
J. Vallerga;J. McPhate;A. Tremsin;O. Siegmund;B. Mikulec;A. Clark
A new hybrid optical detector is described that has many of the attributes desired for the next generation adaptive optics (AO) wavefront sensors. The detector consists of a proximity focused microchannel plate (MCP) read out by multi-pixel application specific integrated circuit (ASIC) chips developed at CERN (“Medipix2”) with individual pixels that amplify, discriminate and count input events. The detector has 256×256 pixels, zero readout noise (photon counting), can be read out at 1kHz frame rates and is abutable on 3 sides. The Medipix2 readout chips can be electronically shuttered down to a temporal window of a few microseconds with an accuracy of 10ns. When used in a Shack–Hartmann style wavefront sensor, a detector with 4 Medipix chips should be able to centroid approximately 5000 spots using 7×7 pixel sub-apertures resulting in very linear, off-null error correction terms. The quantum efficiency depends on the optical photocathode chosen for the bandpass of interest.
