Baseline estimation method of digital multi-channel pulse height analyzer based on FPGA

LI Weinan; YANG Chaowen; ZHOU Rong

doi:10.11889/j.0253-3219.2015.hjs.38.060403

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Baseline estimation method of digital multi-channel pulse height analyzer based on FPGA

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- Baseline estimation method of digital multi-channel pulse height analyzer based on FPGA
- NUCLEAR TECHNIQUES Vol. 38, Issue 6, Article number: 060403(2015)
- 作者机构：
  
  四川大学物理科学与技术学院,成都,610064
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.060403
  CLC：
- Published：05 June 2015
- 稿件说明：
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LI Weinan, YANG Chaowen, ZHOU Rong. Baseline estimation method of digital multi-channel pulse height analyzer based on FPGA[J]. Nuclear techniques, 2015, 38(6): 060403
DOI：

LI Weinan, YANG Chaowen, ZHOU Rong. Baseline estimation method of digital multi-channel pulse height analyzer based on FPGA[J]. Nuclear techniques, 2015, 38(6): 060403 DOI： 10.11889/j.0253-3219.2015.hjs.38.060403.

摘要

从对数字化波形基线求取的准确性、实时性、灵敏度以及算法对硬件资源占有量等方面出发，分析直方图统计法和平均值法的优劣，提出了一种动态实时提取随机信号数字化波形基线的方法，并利用基于现场可编程门阵列(Field-Programmable Gate Array

FPGA)的数字多道脉冲幅度分析器对几种方法进行了测试。直方图统计法具有较高的准确性，将其结果与动态实时提取随机信号数字化波形基线方法的实验结果进行比较，验证了该方法在占有较少硬件资源和计数率较高的条件下，同样具有较高的准确性、实时性和灵敏度，并且对能谱分辨率有所改善。

Abstract

Background: Histogram statistics method and average value method are widely used to obtain the baseline of nuclear signal processing. However

there still exist several shortcomings

such as low accuracy

weak real-time character and high hardware resource occupancy. Purpose: This study aims to improve the accuracy and the real-time performance of the baseline extraction for the digital nuclear instruments. Methods: A novel method of obtaining baseline is proposed

it is a real-time dynamic average method that can be easily implemented on a Field-Programmable Gate Array (FPGA) based multi-channel pulse height analyzer. By setting appropiate parameters

the accuracy and real-time character could be obviously improved. Results: This novel method not only occupies less hardware resource

but also achieves higher accuracy. The energy resolution of 137Cs spectrum is got improved to 7.44%. Conclusion: This method can be applied to extract baseline of digital multi-channel pulse height analyzer with high accuracy and real-time response. Abstract

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