基于脉冲型中子探测器信号特性的核信号发生器研究

Research on Nuclear Signal Generator Based on Signal Characteristics of Pulsed Neutron Detector

脉冲型中子探测器将中子注量率转化为随机微弱电流脉冲信号,由于该信号的特殊性,核测量设备一般需要借助堆上试验验证实际探测性能。由于通过堆上试验的研究方式花费较大且时间受限,本文以涂硼正比计数管这类典型的脉冲型中子探测器为对象,研究了一种脉冲型中子探测器信号模型及其核信号发生器实现方案。通过仿真验证了各关键部分特性,验证结果表明:所提出的核信号发生器方案可以产生满足指数分布的时间间隔序列,单脉冲形状与探测器信号相似,幅度可按均匀分布随机变化。

Pulsed neutron detector converts neutron fluence rate into random weak current pulse signal.Due to the particularity of this signal,nuclear measurement equipment generally requires reactor tests to verify the actual detection performance.Because of the research method by reactor test costs a lot and has time limit,this paper,based on a typical pulsed neutron detector such as boron-coated proportional counting tube,studies a pulsed detector signal model and its nuclear signal generator implementation scheme.The characteristics of each key part are verified through simulation.The verification results show that:the proposed nuclear signal generator scheme can generate a sequence of time intervals satisfying the exponential distribution,the single current pulse shape is similar to the detector and the amplitude can vary randomly in a uniform distribution.