低本底伽马能谱仪闪烁探测器的智能化温控系统设计

Design of intelligent temperature control system for the scintillation detector of low background gamma spectrometer

为了消除环境温度对闪烁体相对光输出影响带来的谱线漂移问题,设计了一种新型智能化温控系统。设计专用循环水路,采用改进的PID控制算法实时调整制冷加热模块输出电流,完成温度采集、控制操作,实现对闪烁体探测器的恒温控制。系统可通过CAN总线或USB接口与主机控制器进行数据交互,兼容现有能谱仪。经试验可知,温控系统温度稳态误差小于0.5℃,核素特征峰基本无漂移,满足稳谱使用要求,具有较高的应用价值。

In order to solve the problem of spectral drift caused by the changes of ambient temperature,an intelligent temperature control system with dedicated circulation waterway was developed.The improved PID control algorithm were designed to adjust the output current of the refrigeration and heating module in real time,so as to acquire temperature data and realize the constant temperature control of the scintillator detector.The system can interact with the host controller through CAN bus or USB interface,which is compatible with existing spectrometers.The experiment showed that the steady-state error of the system is less than 0.5℃,and the characteristic peak of nuclide has no noticeable drift during the spectrum acquisition process.The system can meet the requirements of spectrum stabilization for the spectrometer.