摘要
在某些特定的(如反应堆)密闭空间中,仪表上的温度、压强等数据是系统安全运行的重要保障。正常情况下是将监测数据传输出来以判断系统运行是否正常,但是该方法有供电线和传输线的存在,需要对密闭空间进行开孔或其他方法处理,对其密闭性会产生一定的影响。针对密闭空间机械表盘指针数据读出的问题,采用放射性测量方法,将指针上放置了放射源的机械结构表盘置于密闭空间内部,当表盘指针移动时,放射源的位置也随之发生变化,利用探测器在密闭空间外部对放射源进行测量,间接读出表盘数据。用Geant4软件对上述表盘结构进行模拟,设计了6个掺铈钆镓铝石榴石(GAGG:Ce)探测器组成的圆形探测器阵列系统,根据该系统模拟得到的全能峰探测效率与位置的关系通过模糊逻辑算法处理,可以准确读出放射源所在位置的角度,从而达到读出表盘数据的目的。结果表明:当表盘的半径8.5 cm,探测器间隔42°时,在40°、85°、125°、170°附近时的模拟计算得到的角度与实际角度存在较大偏差。因此对模型进行了改进,表盘半径改为2.3 cm,探测器间隔改为55°后角度与实际角度的相对偏差在1°以内,转换为温度误差在0.5℃以内,最后实测数据验证,实测时角度误差在3°以内,温度误差在1℃以内,达到了测量要求。
In certain specific enclosed spaces(such as reactors),temperature,pressure,and other data on instruments are important guarantees for the safe operation of the system.Under normal circumstances,monitoring data is transmitted to determine whether the system is operating properly.However,this method involves the presence of power and transmission lines,which require drilling or other methods to treat enclosed spaces,which can have a certain impact on their airtightness.This article focuses on the problem of reading data from mechanical dial pointers in enclosed spaces.A radioactive measurement method is adopted,where the mechanical structure dial with a radioactive source placed on the pointer is placed inside the enclosed space.When the dial pointer moves,the position of the radioactive source also changes.A detector is used to measure the radioactive source outside the enclosed space and indirectly read the dial data.The above dial structure was simulated using Geent4 sofware,and a circular detector array system consisting of six gadolinium gallium aluminum garnet(GAGG:Ce)scintillator detectors was designed.Based on the relationship between the detection efficiency of the full energy peak and the position obtained from the system simulation,the angle of the position of the radiation source can be accurately read out through fuzzy logic algorithm,thereby achieving the purpose of reading the dial data.The results show that when the radius of the dial is 8.5 cm and the detector spacing is 42°,there is a significant deviation between the simulated calculated angles and the actual angles near 40°,85°,125°,and 170°.Therefore,the model was improved by changing the dial radius to 2.3 cm and the detector spacing to 55°.The relative deviation between the angle and the actual angle was within 1°,which was converted into a temperature error of 0.5℃.Finally,the measured data was verified to be within 3o and 1℃,meeting the measurement requirements.
作者
赵扬
梁江涛
梁知洋
陈峰立
刘旭睿
胡彪
谭良
杨体波
王敏
ZHAO Yang;LIANG Jiangtao;LIANG Zhiyang;CHEN Fengli;LIU Xurui;HU Biao;TAN Liang;YANG Tibo;WANG Min(College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,Chengdu 610059,China)
出处
《核电子学与探测技术》
CAS
北大核心
2024年第3期486-496,共11页
Nuclear Electronics & Detection Technology
基金
国家自然科学基金-青年基金(No.12005026)
四川省科技计划(No.2021JDRC0028)
关键词
Geant4模拟
模糊逻辑
无损监测
全能峰效率
Geant4 simulation
fuzzy logic
non-destructive monitoring
all-round peak efficiency
