Simulation study on digital processing of fission chamber output signal

YUAN Chao; LI Yongping; HUANG Yuefeng

doi:10.11889/j.0253-3219.2015.hjs.38.010401

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Simulation study on digital processing of fission chamber output signal

更新时间：2021-03-03

- Simulation study on digital processing of fission chamber output signal
- NUCLEAR TECHNIQUES Vol. 38, Issue 1, Article number: 010401(2015)
- 作者机构：
  
  1. 中国科学院上海应用物理研究所嘉定园区,上海,201800
  2. 中国科学院大学,北京,100049
  3. 中国科学院核辐射与核能技术重点实验室,上海,201800
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.010401
  CLC：
- Published：07 January 2015
- 稿件说明：
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YUAN Chao, LI Yongping, HUANG Yuefeng. Simulation study on digital processing of fission chamber output signal[J]. Nuclear techniques, 2015, 38(1): 010401
DOI：

YUAN Chao, LI Yongping, HUANG Yuefeng. Simulation study on digital processing of fission chamber output signal[J]. Nuclear techniques, 2015, 38(1): 010401 DOI： 10.11889/j.0253-3219.2015.hjs.38.010401.

摘要

中子通量密度是核反应堆工程中的一个重要参数，利用裂变室进行宽量程中子通量密度测量的数字化处理系统较传统的模拟电路有更大优势。本文基于数字化中子通量测量方案进行仿真研究，首先用计算机模拟带电子学噪声的裂变室输出信号仿真波形，提出在低通量和高通量的中子通量密度情况下，用数字梯形成形滤波和数字自适应参数滤波算法，不仅可以实现抗堆积和脉冲噪声有效甄别（脉冲模式）处理，提高计数率的准确度，而且能够提高均方值计算（坎贝尔模式）的准确度。

Abstract

Background: Neutron flux density is an important parameter related to nuclear power of the reactor. Digitized processing of neutron flux density in a wide measurement range of fission chamber detector has more advantages than the traditional analog circuits. Purpose: The aim is to improve the accuracy of neutron counting in the pulse mode

as well as mean square value calculation in the Campbell mode. Methods: The waveform of the output signal of fission chamber with various electronic noise was simulated

and then a trapezoidal shape filtering and digital adaptive filtering were employed to deal with digitized waveform signal of fission chamber in both low neutron flux density (pulse mode) and high neutron flux density (Campbell mode) circumstances. Results: By using these two methods

the accuracy of both the pulse counting and mean square value calculation was improved. Conclusion: Trapezoidal shape filtering and digital adaptive filtering can be applied to process digitized fission chamber output signal to achieve precise measurement of the neutron flux density in a wide range. Abstract

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