光中子成像多路数据获取系统研制  

Development of the Data Acquisition System for Photoneutron Imaging

作　　者：董云宁[1] 张智[1] 杨祎罡[1] 刘平[1] 

机构地区：[1]清华大学工程物理系粒子技术与辐射成像教育部重点实验室,北京100084

出　　处：《核电子学与探测技术》2015年第10期970-973,共4页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金面上项目(11375095)资助

摘　　要：研制了一套用于强X射线场下多路中子探测器信号处理和采集的数据获取系统。该系统接收探测器信号,分别对其做不同时间范围的积分,两个积分信号的幅度可用作波形甄别。采用现场可编程逻辑器件(FPGA)和硬件描述语言(verilog)实现对探测器和前端电路的测量控制,得到的数据经STM32微控制器控制传输给计算机。使用两种输入信号进行信号采集测试表明:该系统可正常地进行采集工作,得到的数据能够用于区分不同形状的信号。Because of the strong X - ray background, detecting neutron signals is difficult in photoneutron imaging research. To avoid the strong interference of X - ray, we designed special measuring time window and n/y discrimination circuits. This system can process and acquire useful signals of multi - channel photoneutron detectors. Specialized logic based on the Field Programmable Gate Array（FPGA） controls the whole measurement and data collection process. A STM32 microcontroller is in charge of the data transmission. The system has been tested using signals of different shape and the result shows its ability to acquire data and discriminate different pulse shapes.

关 键 词：光中子 波形甄别 数据采集 现场可编程逻辑器件 

分 类 号：TL816.3[核科学技术—核技术及应用]