|
|
基于双指数拟合的核信号堆积脉冲重构方法
|
Abstract:
高计数率下核脉冲信号容易发生堆积，将堆积脉冲直接舍弃的方法会导致能谱计数率的下降。本文用硅漂移探测器对X光管激发的铜合金样品进行测量，采用14位20 MHz的ADC采样获取数据，在Matlab上对输出信号进行冲激成形以识别堆积脉冲，应用双指数表达式对堆积脉冲进行重构并进行幅值提取计入能谱中。结果表明，与传统的直接舍弃堆积脉冲相比，该方法提高了能谱计数，提升率约为21.37%。
Nuclear pulse tend to pile up at high count rate. The traditional method is to discard the pile-up pulse, which will decrease the energy spectrum count rate. In this paper, silicon drift detector is used to measure the copper alloy excited by X-ray tube, 14-bit 20 MHzADC is used to obtain the data, impulse pulse-shaping is performed on Matlab to identify the pile-up pulse of the output signal, and the pile-up pulse is reconstructed by double-exponential expression and the amplitude is extracted and included in the energy spectrum. The results show that, compared with directly rejecting the pile-up pulse, this method improves the energy spectrum count by 21.37%.
| [1] | 宋文刚, 张立军, 张晶, 王冠鹰. 硅漂移探测器数字脉冲处理技术[J]. 物理学报, 2022, 71(1): 80-88. |
| [2] | Lee, M., Lee, D., Ko, E., et al. (2019) Pulse Pileup Correction Method for Gamma-Ray Spectroscopy in High Radiation Fields. Nuclear Engineering and Technology, 52, 1029-1035. https://doi.org/10.1016/j.net.2019.12.003 |
| [3] | 张怀强, 吴和喜, 汤彬, 等. 数字核谱仪系统中脉冲堆积识别方法的研究[J]. 东华理工大学学报: 自然科学版, 2012, 35(3): 281-284. https://doi.org/10.3969/j.issn.1674-3504.2012.03.013 |
| [4] | 周伟, 周建斌. 基于双参数模型核脉冲信号数字高斯成形技术[J]. 物探与化探, 2015, 39(2): 318-321. |
| [5] | Zhou, J.-B., Liu, Y., Xu, H., et al. (2015) Trape-zoidal Pulse Shaping for Pile-Up Pulse Identification in X-Ray Spectrometry. Chinese Physics C, 39, 112-117. https://doi.org/10.1088/1674-1137/39/6/068201 |
| [6] | Xu, H., Ma, Y.-J., Zhou, J.-B., et al. (2015) New Methods to Remove Baseline Drift in Trapezoidal Pulse Shaping. Nuclear Science and Techniques, 26, 60-64. https://doi.org/10.13538/j.1001-8042/nst.26.050402 |
| [7] | 洪旭, 倪师军, 周建斌, 等. 梯形成形算法中成形参数与成形脉冲波形关系研究[J]. 核电子学与探测技术, 2016, 36(2): 150-153, 158. https://doi.org/10.3969/j.issn.0258-0934.2016.02.008 |
| [8] | 范新洋, 王敏, 洪旭, 等. 尖峰脉冲成形算法改进与性能分析[J]. 核技术, 2021, 44(1): 59-65. |
| [9] | 孙超, 饶开友, 郭景富, 等. 数字化多道中双指数脉冲梯形成形算法研究[J]. 核电子学与探测技术, 2017, 37(7): 752-756. |
| [10] | Jordanov, V.T. (2015) Unfolding-Synthesis Technique for Digital Pulse Processing. Part 1: Unfolding. Nuclear Instruments & Methods in Physics Research, 805, 63-71. https://doi.org/10.1016/j.nima.2015.07.040 |
| [11] | Wang, X.Y., Zhou, J.B., Wang, M., et al. (2022) Signal Modeling and Impulse Response Shaping for Semiconductor Detectors. Nuclear Science and Techniques, 33, 1-11. https://doi.org/10.1007/s41365-022-01027-9 |
| [12] | 曾家骏, 何剑锋, 袁兆林, 等. 数字多道中双指数脉冲梯形成形算法的实现与测试[J]. 电子测量与仪器学报, 2021, 35(9): 129-135. |
| [13] | Liu, Y., Wang, M., Wan, W., Zhou, J., Hong, X., Liu, F. and Yu, J. (2020) Counting-Loss Correction Method Based on Dual-Exponential Impulse Shaping. Journal of Synchrotron Radiation, 27, 1609-1613.
https://doi.org/10.1107/S1600577520010954 |
| [14] | 汪雪元, 周建斌, 何剑锋, 等. 核脉冲信号冲激成形的导数求解方法[J]. 核技术, 2022, 45(7): 67-74. |
