基于数字fpga的脉冲处理气体伽玛辐射探测器的噪声抑制

A. Pudov, S. Sokolov, A. S. Abyzov, A. Rybka, V. Kutny
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引用次数: 0

摘要

充满气体的电离辐射比例探测器通常包含诸如细阳极线之类的元素,这使它们对外部声学或振动冲击敏感。本研究对填充高纯度氙气的比例辐射探测器的这种灵敏度进行了研究。探测器的信号噪声依赖于外部声波频率,其特征很可能取决于探测器的设计,即阳极线的直径和抗拉强度等参数。为了抑制噪声对探测器特性的负面影响,探测器数字信号在现场可编程门阵列板上进行处理。作者研究了“时间窗”算法,该算法允许从有用信号(即电离脉冲)中分离(过滤)充气探测器输出信号中由于外界声音影响而产生的低频噪声。这种方法允许在具有显著声学噪声背景的情况下执行-辐射的光谱测量,当具有传统模拟光谱通道的探测器无法处理任务时。
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Digital FPGA-based processing of pulses of gas-filled gamma-radiation detector for acoustic noise suppression
Gas-filled proportional detectors of ionizing radiation often contain such elements as thin anode wire, which make them sensitive to external acoustic or vibrational impact. This study investigates such sensitivity for the case of the proportional -radiation detectors filled with high-purity xenon gas. The detector demonstrates a dependence of its signal noise on the external acoustic wave frequency, the character of which most likely depends on the design of the detector, i.e. on such parameters as diameter and tension strength of the anode wire, etc. To suppress the negative impact of acoustic noise on the characteristics of the detector, the detector digital signal is processed in a Field-Programmable Gate Array board. The authors investigate the algorithm of «time windows», which allows separating (filtering) low-frequency noise in the output signal of a gas-filled detector, which arises due to the influence of external sound, from the useful signal, i.e. the ionization pulses. This approach allows performing spectral measurements of -radiation with a significant acoustic noise background, when detectors with a conventional analog spectrometric channel cannot handle the task.
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