Photon Event Centroiding with UV Photon‐counting Detectors
Photon Event Centroiding with UV Photon‐counting Detectors
复制标题
使用紫外光子计数探测器进行光子事件质心分析
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Leahy
中科院分区：
文献类型：
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作者：
J. Hutchings;J. Postma;D. Asquin;D. Leahy
我们报告了用ASTROSAT紫外成像望远镜的实验室原型探测器采集的光子计数数据，以及质心算法的选择和飞行参数设置。讨论了事件识别的阈值。最优事件质心算法为5 × 5像素加权均值，去除偏置后精度为2%-3%。这可以通过使用光子事件子阵列的最低值角像素在每个读出帧内实现。我们还讨论了标记双光子事件的其他角像素阈值，以及使用不同算法和事件速率纠正质心误差的方法。
We report on photon‐counting data taken with a laboratory prototype detector for the ASTROSAT UV imaging telescope, and the selection of the centroiding algorithms and parameter settings for flight. Thresholds are discussed for event recognition. The optimum event centroid algorithm is a 5 × 5 pixel weighted mean, after bias removal accurate to 2%–3%. This can be achieved within each readout frame by using the lowest value corner pixel of the photon event subarray. We also discuss other corner pixel thresholds for flagging double‐photon events, and methods of correcting centroiding errors with different algorithms and event rates.