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首页> 外文期刊>Measurement Science & Technology >Sample-interpolation timing: an optimized technique for the digital measurement of time of flight for gamma rays and neutrons at relatively low sampling rates
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Sample-interpolation timing: an optimized technique for the digital measurement of time of flight for gamma rays and neutrons at relatively low sampling rates

机译：样本插值定时：一种用于以较低采样率数字测量伽马射线和中子飞行时间的优化技术

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摘要

A unique, digital time pick-off method, known as sample-interpolation timing (SIT) is described. This method demonstrates the possibility of improved timing resolution for the digital measurement of time of flight compared with digital replica-analogue time pick-off methods for signals sampled at relatively low rates. Three analogue timing methods have been replicated in the digital domain (leading-edge, crossover and constant-fraction timing) for pulse data sampled at 8 GSa s~(-1). Events arising from the ~(7)Li(p, n)~(7)Be reaction have been detected with an EJ-301 organic liquid scintillator and recorded with a fast digital sampling oscilloscope. Sample-interpolation timing was developed solely for the digital domain and thus performs more efficiently on digital signals compared with analogue time pick-off methods replicated digitally, especially for fast signals that are sampled at rates that current affordable and portable devices can achieve. Sample interpolation can be applied to any analogue timing method replicated digitally and thus also has the potential to exploit the generic capabilities of analogue techniques with the benefits of operating in the digital domain. A threshold in sampling rate with respect to the signal pulse width is observed beyond which further improvements in timing resolution are not attained. This advance is relevant to many applications in which time-of-flight measurement is essential.
机译：描述了一种独特的数字时间提取方法，称为采样插值定时（SIT）。与以较低速率采样的信号的数字复制-模拟时间提取方法相比，该方法证明了用于飞行时间的数字测量的改进定时分辨率的可能性。在数字域中已经对三种以8 GSa s〜（-1）采样的脉冲数据模拟了类似的计时方法（前沿，交叉和恒定分数计时）。 〜（7）Li（p，n）〜（7）Be反应引起的事件已用EJ-301有机液体闪烁器检测到并用快速数字采样示波器记录了下来。采样插值时序是专门为数字域开发的，因此与数字复制的模拟时间提取方法相比，其在数字信号上的效率更高，尤其是对于以当前价格适中的便携式设备可以达到的速率采样的快速信号。样本插值可以应用于以数字方式复制的任何模拟定时方法，因此也具有利用模拟技术的通用功能并具有在数字域中运行的优势的潜力。观察到相对于信号脉冲宽度的采样率阈值，超过该阈值就无法实现时序分辨率的进一步改善。这一进步与许多需要飞行时间测量的应用有关。

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