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本文对理想核脉冲信号和实际探测器输出信号分别进行了计算机模拟仿真与分析,总结了不同成形时间的核脉冲信号的数字梯形成形参数的确定方法。在高计数率场合时提高了有效测量计数率,消除了部分脉冲的堆积并减少了系统死时间。同时,采用256点和512点数字三角成形方法测试了Si-PIN半导体探测器的性能,并与模拟电路成形方法进行了对比测试。测试结果表明,脉冲数字成形处理方法提高了探测器计数率和分辨率。
In this paper, computer simulations and analyzes of the ideal nuclear pulse signal and the actual detector output signal are respectively carried out. The methods for determining the digital trapezoidal shape parameters of nuclear pulse signals with different forming time are summarized. Increasing the effective measurement count rate at high count rates eliminates part of the pulse build-up and reduces system dead time. At the same time, the performance of Si-PIN semiconductor detector was tested by 256-point and 512-point digital triangle forming method, and compared with the analog circuit forming method. The test results show that the pulse digital shaping method improves the detector counting rate and resolution.