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首页> 外文会议>Conference on Optical and Infrared Detectors for Astronomy; 20040621-20040622; Glasgow; GB >Performance limitations of small format high speed infrared arrays for active control loops in interferometry and adaptive optics
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Performance limitations of small format high speed infrared arrays for active control loops in interferometry and adaptive optics

机译：小尺寸高速红外阵列在干涉测量和自适应光学中用于主动控制回路的性能限制

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The detector mounted in the VLTI fringe sensor FINITO is a 256x256 HgCdTe array with a cut-off wavelength of 1.9 micron. The same arrays having cut-off wavelengths of 2.5 micron will be used in the tip tilt sensor IRIS and the PRIMA instrument of the VLT interferometer. The arrays are part of an active control loop with integration times as short as a few hundred microseconds. The fringe tracker FINITO uses only 7 pixels of the array. To take advantage of the four parallel channels of the PICNIC multiplexer, the pixels illuminated in each quadrant are positioned at the same location within the quadrants. A noise analysis of the PICNIC array shows that the main sensitivity limitation of the array is contained in the low frequency part of the noise power spectrum. Similar behaviour has been observed with other infrared arrays. In an effort to optimize the unit cell pixel buffer to achieve high speed and low noise, a prototype multiplexer is being developed at Rockwell for adaptive optics. However, low frequency noise may still be the limiting factor dominating the noise performance of infrared arrays. To overcome this noise barrier, detector architectures have to be envisaged which should allow double correlated sampling on shorter time scales than a full exposure. This might be accomplished by some kind of gate in the IR material which allows charge to be shifted from an integrating well in the infrared pixel to a small sensing node capacitance of the multiplexer unit cell buffer.
机译：安装在VLTI条纹传感器FINITO中的检测器是256x256 HgCdTe阵列，其截止波长为1.9微米。截止倾斜度为2.5微米的相同阵列将用于尖端倾斜传感器IRIS和VLT干涉仪的PRIMA仪器中。阵列是主动控制回路的一部分，积分时间短至数百微秒。条纹跟踪器FINITO仅使用阵列的7个像素。为了利用PICNIC多路复用器的四个并行通道，每个象限中照亮的像素位于这些象限内的相同位置。 PICNIC阵列的噪声分析表明，该阵列的主要灵敏度限制包含在噪声功率谱的低频部分。对于其他红外阵列，也观察到了类似的行为。为了优化晶胞像素缓冲器以实现高速和低噪声，罗克韦尔公司正在开发一种自适应光学原型多路复用器。但是，低频噪声仍然可能是控制红外阵列噪声性能的限制因素。为了克服这种噪声屏障，必须设想一种检测器架构，该架构应允许在比全曝光短的时间尺度上进行双重相关采样。这可以通过IR材料中的某种门来实现，该门允许电荷从红外像素中的积分阱转移到多路复用器单位单元缓冲器的较小传感节点电容。

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