Cross-strip readouts for photon counting detectors with high spatial and temporal resolution
Cross-strip readouts for photon counting detectors with high spatial and temporal resolution
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DOI：
10.1109/tns.2004.832987
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发表时间：
2004-08-01
影响因子：
1.8
通讯作者：
Abiad, R
中科院分区：
文献类型：
--
作者：
Tremsin, AS;Siegmund, OHW;Abiad, R
光电阴极、微通道板堆叠和光子计数、成像读出的组合为X射线到可见光光谱范围的高动态范围、高空间分辨率和高定时精度检测器提供了强大的工具。空间分辨率、量子效率和背景速率的显著改进使得这些器件对许多应用具有吸引力，并正被应用于全新的研究领域。我们描述了高分辨率交叉条带（XS）阳极读出的光子计数成像与微通道板（MCP）的最新发展。我们表明，MCP探测器的空间分辨率与交叉条读出现在仅限于MCP孔的宽度。对于第一次，我们展示了分辨率测试掩模的图像，说明了交叉条带读出的特殊空间分辨率，目前可以解决类似于7 μ m的尺度上的特征，MCP增益低至6 × 10（5）。本文所示的具有高空间分辨率的探测器的低增益操作对于具有高局部计数率和长寿命要求的应用是非常有益的。XS阳极的空间分辨率可以通过改进的阳极均匀性、较低噪声的前端电子设备和新的质心算法进一步提高。这可能是重要的，当MCP小于现有的6 μ m的孔隙变得商业化，从而提高检测器分辨率下降到几微米尺度。
The combination of a photocathode, microchannel plate stack and photon counting, imaging readout provides a powerful tool for high dynamic range, high spatial resolution, and high timing accuracy detectors for the X-ray to visible light spectral range. Significant improvements in spatial resolution, quantum efficiency, and background rate have made these devices attractive for many applications and are being applied to completely new research areas. We describe the latest developments in high-resolution cross-strip (XS) anode readout for photon counting imaging with microchannel plates (MCPs). We show that the spatial resolution of an MCP detector with the cross-strip readout is now limited only by the MCP pore width. For the first time, we show images of resolution test masks illustrating the exceptional spatial resolution of the cross-strip readout, which at the present time can resolve features on the scale of similar to7 mum with MCP gains as low as 6 x 10(5). Low-gain operation of the detector with high spatial resolution shown in this paper is very beneficial for applications with high local counting rate and long lifetime requirements. The spatial resolution of the XS anode can be increased even further with improved anode uniformity, lower noise front-end electronics, and new centroiding algorithms. This could be important when MCPs with smaller than existing 6 mum pores become commercially available, thus improving the detector resolution down to the few micrometer scale.