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手持式单板500 MHz采样率数字化多道设计
Design of handheld 500-MHz digital multi-channel analyzer on single board
- 核技术 2017年40卷第3期 文章编号：030401
- 作者机构：
1.成都理工大学 地学核技术重点实验室 成都 610059
2.西北核技术研究所 西安 710024
- 作者简介：
[ "曾国强, 男, 1980年出生, 2008年于成都理工大学获博士学位, 从事核辐射探测与核电子学", "ZENG Guoqiang, male, born in1980, graduated from Chengdu University of Technology with a doctoral degree in 2008, focusing on nuclear radiation detection and nuclear electronics" ]
- 基金信息：国家自然科学基金(41474159);国家863计划项目(2012AA061803)
DOI：10.11889/j.0253-3219.2017.hjs.40.030401
中图分类号： TL82收稿日期：2016-10-24，
修回日期：2016-12-26，
纸质出版日期：2017-03-10
- 稿件说明：
移动端阅览
曾国强, 欧阳晓平, 喻明福, 等. 手持式单板500 MHz采样率数字化多道设计[J]. 核技术, 2017,40(3):030401
Guoqiang ZENG, Xiaoping OUYANG, Mingfu YU, et al. Design of handheld 500-MHz digital multi-channel analyzer on single board[J]. Nuclear techniques, 2017, 40(3): 030401
曾国强, 欧阳晓平, 喻明福, 等. 手持式单板500 MHz采样率数字化多道设计[J]. 核技术, 2017,40(3):030401 DOI： 10.11889/j.0253-3219.2017.hjs.40.030401.
Guoqiang ZENG, Xiaoping OUYANG, Mingfu YU, et al. Design of handheld 500-MHz digital multi-channel analyzer on single board[J]. Nuclear techniques, 2017, 40(3): 030401 DOI： 10.11889/j.0253-3219.2017.hjs.40.030401.
摘要
针对Cs2LiYC16：CE（CLYC）闪烁晶体、掺硼塑料闪烁体等中子/γ探测器的电流脉冲波形的甄别，需要高速数字化多道脉冲幅度分析器。采用直接耦合方式设计高速模拟前端电路，将高速模数转换器（Analog-to-DigitalConverter，ADC）配合现场可编程逻辑门阵列（Field-Programmable Gate Array，FPGA）芯片实现数字化设计，在FPGA内部实现了高速数字滤波、脉冲幅度提取、基线扣除、谱线存储与传输等功能。通过嵌入式的PowerPC内核，实现替代外部控制器的复杂时序功能，并挂接通用串行总线（Universal Serial Bus，USB）外设芯片实现与外部计算机的高速双向数据传输。本文还设计了低噪声、大电流的开关电源，最终实现了可脱机独立运行的手持式单板高速数字多道。通过实测数字多道的模拟前端电路大信号带宽达110 MHz，小信号带宽达200 MHz，实时采样率为500 MHz，脉冲计数通过率大于10
7
s
-1
，线性度达0.999 8，连接NaI（Tl）、掺硼塑料闪烁体、LaBr
3
（Ce）等闪烁体探测器实测谱线合理，满足实际使用要求。
Abstract
Background
2
Rising time discrimination of current pulse signal by using Cs2LiYC16:CE (CLYC)
boron plastic scintillator and other neutron gamma detector
analog multi-channel and common digital multi-channel analyzer can not meet the requirements.
Purpose
2
This study aims to develop a high-speed digital multi-channel analyzer.
Methods
2
In this paper
by using the direct coupling way
a special high-speed analog front end circuit is designed. The high-speed analog-to-digital converter (ADC) is connected with field-programmable gate array (FPGA) could realize digital design well
then the system will finish data filtering
pulse amplitude extraction
baseline restorer
spectrum storage
transmission function and so on in the FPGA chip. The universal serial bus (USB) peripheral hangs on the embedded PowerPC kernel
the system can not only simplify the complex timing function of the external controller
but also realize high-speed data transmission with personal computer software. In this work
low noise and high current switching power supply is also designed
finally implemented a hand-held offline independent operation of the high speed digital multi-channel single plate.
Results
2
After the experimental tests
we can see that the digital multi-channel analog front end circuit designed in this paper used in NaI (Tl)
boron plastic scintillator
LaBr
3
(Ce) and other scintillation detector can reach to 110 MHz of large signal bandwidth and climb to 200 MHz of small signal bandwidth. Furthermore
it also has real-time sampling rate of 500 MHz
pulse counting rate by more than 10
7
s
-1
and the linearity is up to 0.999 8.
Conclusion
2
The ultimate measured scintillation spectrum in this paper can satisfy the actual requirement.
关键词
Keywords
references
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