Research for Pulse Counting Interference Recognition Technique Based on Average Value of Power Spectrum
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摘要: 针对堆外核测量系统源量程脉冲计数干扰现象，提出使用脉冲计数率的功率谱均值作为判定值识别脉冲计数干扰的方法。功率谱均值的判定值根据实堆数据计算，并根据脉冲计数率大小设置3个值。使用仿真的方法验证干扰识别效果，在实堆的脉冲计数率数据基础上，叠加干扰计数。通过仿真验证，该方法能够识别持续时间为1 s、干扰强度（干扰相对于脉冲计数率的比值）在5%以上的干扰信号。Abstract: Aiming at the interference of pulse counting in the source range of the Ex-core nuclear measurement system, a method to identify the interference of pulse counting using the average value of power spectrum of pulse counting rate as the decision value is proposed. The decision value of the average value of power spectrum is calculated according to the real reactor data, and three values are set according to the pulse counting rate size. The simulation method is used to verify the effect of interference identification, and the interference counting is superimposed on the pulse counting rate data of the real reactor. The simulation results show that the method can identify the interference signal with a duration of 1 s and an interference intensity (the ratio of interference to pulse counting rate) above 5%.
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图 2 实堆脉冲计数率及功率谱均值计算结果
Figure 2. Real Reactor Pulse Counting Rate and Result for Average Value of Power Spectrum
图 3 低脉冲计数率时干扰识别效果
Figure 3. Effect of Interference Identification for Low Pulse Counting Rate
图 4 高脉冲计数率时干扰识别效果
Figure 4. Effect of Interference Identification for High Pulse Counting Rate
表 1 不同干扰强度下的反应堆周期最小值
Table 1. Minimum Value of Reactor Cycle under Different Interference Intensities
干扰强度/% 反应堆周期最小值/s 100 1.05 50 1.39 10 3.64 6 4.89 5 5.41 4 7.53 
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