利用位置敏感型光电倍增管测量光斑漂移的定标方法

将位置敏感光电倍增管(Position sensitive photomultiplier tube,简称PSPMT)引入大气湍流引起的漂移效应的实验测量中.基于PSPMT的工作原理,分析了探测器的放置位置对输出信号的影响,通过实验方法对PSPMT进行了位置定标和增益定标,获得了入射光束在探测面上的位置坐标.测量结果显示:在入射光斑尺度达到厘米量级同时具有较高强度的情况下,一次采样无法正确反映入射位置.因此以若干次测量的统计平均值表示入射位置,并综合考虑采集卡的最高采样率、采样点和信号频率等因素,分析了在漂移测量中如何选择进行统计平均的数据点的个数.

Calibration of the position sensitive photomultiplier tube in spot dancing measurement

The position sensitive photomultiplier tube (PSPMT) was introduced to the experimental measurement of laser beam wandering induced by atmospheric turbulence. Based on the operating principle of PSPMT, the effect of the detector's placement to the output signal was analyzed. The position and gain calibration was experimentally performed in order to obtain the position coordinates of the incident light in the active area of PSPMT. The experimental measurements show only one sample can't express the position of the incident light correctly when the light is strong and the beam width has the order of centimeter. So the statistic mean position of some samples for the same incident light was used to denote the real incident position. The highest sampling rate and sampling points combined with signal frequency were taken into account to determine the number of sampling points to be averaged.