在中子小角散射实验中,用飞行时间法确定中子能量时,要从长度达数十厘米以上的大尺寸液体闪烁探测器上取得定时信号。由于进入液闪的粒子激发产生的光信号在液闪中的传播速度是有限的,这些光信号到达光电倍增管的时间就是粒子进入依闪的位置的函数。这样,对于需要时间上确定的参考脉冲信号的飞行时间法来说,就需要采用某种办法来减少这个时间不确定性,以便最终提高整个测量系统的时间分辨能力。 In neutron small-angle scattering experiments, the time-of-flight method is used to determine the neutron energy from a large-scale liquid scintillation detector that is tens of centimeters in length. Due to the limited propagation speed of the optical signals generated by the particles entering the liquid flash in the liquid flash, the time at which these optical signals reach the photomultiplier tube is a function of the position of the particles entering the flash. Thus, for time-of-flight methods that require time-resolved reference pulse signals, some means is needed to reduce this time uncertainty in order ultimately to improve the time-resolution of the entire measurement system.