The intrinsically weak signals in ultrafast electron microscopy experiments demand an improvement in the signal-to noise ratio of suitable electron detectors. We provide an experience report describing the installation and operation of a fiber-coupled CMOS based detector in a low energy electron microscope. We compare the detector performance to the traditional multi-channel-plate-based setup. The high dynamic range CMOS detector is capable of imaging spatially localized large intensity variations with low noise. The detector is blooming-free and overexposure appears uncritical. Overall, we find dramatic improvements in the imaging with the fiber-coupled CMOS detector compared to imaging with our previously used multi-channel-plate detector.

中文翻译：

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光纤耦合 CMOS 探测器在低能电子显微镜中的实现和操作

超快电子显微镜实验中固有的微弱信号要求提高合适电子探测器的信噪比。我们提供了一份经验报告，描述了在低能电子显微镜中安装和操作基于光纤耦合 CMOS 的探测器。我们将检测器性能与传统的基于多通道板的设置进行比较。高动态范围 CMOS 探测器能够以低噪声对空间局部大强度变化进行成像。检测器没有晕染，过度曝光似乎并不重要。总的来说，我们发现与我们以前使用的多通道板探测器成像相比，光纤耦合 CMOS 探测器的成像有了显着的改进。