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多阳极PMT的串扰对四象限倾斜跟踪传感器跟踪精度的影响
Error analysis of four-quadrant-based tracking sensor for inevitable crosstalk in multiple anode photomultiplier tube
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摘要: 介绍了四象限倾斜跟踪传感器的原理后，分析了存在光子噪声和串扰条件下的四象限探测器的质心探测误差和光斑位移灵敏度，并推导了存在光子噪声和串扰条件下四象限倾斜跟踪传感器跟踪误差的理论公式，最后通过实验证明了理论分析的正确性．理论分析和实验的结果都表明：当单帧光-电子数一定时，串扰越大，四象限倾斜跟踪传感器的跟踪误差越大；而当串扰一定时，单帧光-电子数越多，四象限倾斜跟踪传感器的跟踪误差越小．Abstract: Based on the basic principle of four-quadrant-based tracking sensor, the centroid detection error and the displacement sensitivity of four-quadrant detector, caused by noise or crosstalk in multiple anode photomultiplier (PMT tube), are analyzed in detail. The tracking error formula of four-quadrant-based tracking senor is given in theory and verified in experiment. The results show that when the photon-electron number per frame is constant, the tracking error of four-quadrant-based tracking senor increases as the crosstalk in multiple-anode PMT increases, and when the crosstalk in multiple-anode PMT is constant, the tracking error of four-quadrant-based tracking senor decreases as the photon-electron numbers increases.
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