基于嵌入式EPICS的中子监测仪研制

朱文超; 林汉尚; 周泽然; 蒋诗平

doi:10.11884/HPLPB202133.200168

基于嵌入式EPICS的中子监测仪研制

doi: 10.11884/HPLPB202133.200168

中国科学技术大学国家同步辐射实验室，合肥 230029

基金项目: 国家自然科学基金面上项目（11675170）

详细信息

作者简介:
朱文超（1994—），男，硕士，从事辐射探测和核电子学相关研究；zhuwench@mail.ustc.edu.cn

通讯作者:
蒋诗平（1963—），男，副研究员，从事辐射探测和 X 射线成像相关研究；spjiang@ustc.edu.cn

中图分类号: TL816
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出版历程
- 收稿日期: 2020-06-16
- 修回日期: 2020-08-10
- 刊出日期: 2021-01-07

Development of a neutron monitor based on embedded EPICS

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029

摘要

摘要: 针对合肥光源（HLS-Ⅱ）辐射防护与安全需求，且合肥光源的控制系统是基于EPICS架构，为减少辐射监测系统中间的环节，提高合肥光源人身安全联锁可靠性，研制了基于嵌入式EPICS控制系统的中子监测仪。中子监测仪的关键部件-探测器选用BF₃针对合肥光源（HLS-Ⅱ）辐射防护与安全需求，研制了基于嵌入式EPICS的中子监测仪，用于场所与环境辐射场中子的监测。合肥光源的控制系统是基于EPICS架构，为减少辐射监测系统中间的环节，提高合肥光源人身安全联锁可靠性，研制了基于嵌入式EPICS控制系统的中子监测仪。中子监测仪的关键部件-探测器选用BF₃正比计数管，通过对正比计数管产生的微弱电信号加2 kV的正高压偏置，交流耦合介入前置放大器放大，后输出固定宽度的脉冲信号。信号由CORTEX-M3电路计数，后经CORTEX-A8电路处理后将数据发布到局域网。利用镅铍中子源和合肥光源现场辐射环境对所研制的监测仪性能进行了初步测试，结果表明，该监测仪达到设计要求，可用于中子监测。
- 合肥光源 /
- CORTEX-M3电路 /
- 前置放大器 /
- 嵌入式EPICS
Abstract: Aiming at the radiation protection and safety requirements of HLS-II (HLS-Ⅱ), a neutron monitor based on embedded EPICS was developed for neutron monitoring of radiation field and environment. The control system of HLS-II is based on EPICS (Experimental Physics and Industrial Control System) architecture. In order to reduce the middle link of the radiation monitoring system and improve the reliability of the personal safety chain of HLS-II, a neutron monitor based on embedded EPICS control system was developed. The key component of the neutron monitor-detector is the BF₃ proportional counter tube. By adding a 2 kV positive high voltage bias to the weak electrical signal generated by the proportional counter tube, the AC coupling intervenes in the preamplifier for amplification, and then outputs a pulse signal with a fixed width. The signal is counted by the CORTEX-M3 circuit, and then processed by the CORTEX-A8 circuit to publish the data to the local area network. The performance of the developed monitor has been preliminarily tested by using Am-Be neutron source and on-site radiation environment of HLS-II. The results show that the monitor meets the design requirements and can be used for neutron monitoring.
- HLS-II /
- Cortex-M3 circuit /
- preamplifier /
- embedded EPICS

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图 1 中子监测仪组成

Figure 1. Neutron monitor composition

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图 2 EPICS架构

Figure 2. EPICS architecture

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图 3 前置放大电路框图

Figure 3. Preamplifier circuit

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图 4 信号源仿真

Figure 4. Signal source simulation

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图 5 监测仪框图

Figure 5. Block diagram of the neutron monitor

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图 6 嵌入式EPICS架构

Figure 6. Embedded EPICS architecture

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图 7 IOC设计流程

Figure 7. IOC design process

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图 8 探测器与上位机显示界面

Figure 8. Detector and OPI

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图 9 性能测试实验

Figure 9. Performance testing

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图 10 应用场所的测试

Figure 10. Testing of application site

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表 1 数据类型

Table 1. Data type

No.	parameter name	attribute	bit width/bit	data type	unit
A1	counting rate	read-only	40	float	cps
A2	absorbed dose rate	read-only	40	float	μGy/h
A3	dose equivalent rate	read-only	40	float	μSv/h

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参考文献(11)

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