高压纹波对光电倍增管计数率的影响及补偿方法

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关键词：光电倍增管；纹波噪声；计数率；卡尔曼滤波；自适应补偿中图分类号：TP274.2；TN911.4 文献标识码：Adoi：10.37188/OPE.20253316.2531 CSTR：32169.14.OPE.20253316.2531

Effects high-voltage ripple on photomultiplier tube count rate compensation techniques

Xiaopeng，LI Jialong*，XU Jinyu

（ ， University， 73Oo7O， ） * Corresponding author， E -mail： 11230708@stu. lzjtu. edu. cn

Abstract：In the production process chemical products，when utilizing radiation from a radioactive source to measure the density a solution by penetrating a pipeline，the count rate output from the photomultiplier tube is susceptible to degradation due to high-voltage ripple noise. This degradation leads to noticeable attenuation in the count rate，thereby reducing the density measurement accuracy. A series methods were proposed to mitigate the impact ripple noise on the count rate compensate for the attenuationcaused by the ripple.First，based on experimental data under various ripple conditions，a mathematical model was established to characterize the relationship between the count rate high-voltage ripple.Analysis this model revealed that reducing the ripple's amplitude frequency effectively diminishes its influence on the count rate. Subsequently，an adaptive Kalman filtering algorithm was employed to suppress the ripple noise.By dynamically adjusting the process measurement noise parameters，the algorithm enabled adaptive compensation the count rate. Experimental validation was carried out using a40% ethanol solution， comparative analysis was performed on the count rate density measurement results before after compensation.The results demonstrate that，compared to the uncorrected state， the pulse count loss rate decreased to 3.54%-5.46% after compensation. Furthermore，the maximum deviation between the measured actual solution density was reduced to 0.019g/cm3 ，with overall density measurement accuracy improved by up to 1.51%

Key words： photomultiplier tube； ripple noise； count rate； Kalman filtering；adaptive compensation

1引言

光电倍增管（PhotomultiplierTube，PMT）具有灵敏度高、噪声低、响应速度快等特点，是检测可见光、紫外光和近红外辐射的最佳仪器。（剩余15609字）