同步辐射光束线束斑形状实时分析技术  

Real-time analysis technology on the shape of synchrotron radiation beam

作　　者：张春波[1,2] 汪启胜[1] 黄胜[1] 何建华[1] 

机构地区：[1]中国科学院上海应用物理研究所张江园区,上海201204 [2]中国科学院大学,北京100049

出　　处：《核技术》2015年第5期8-15,共8页Nuclear Techniques

基　　金：国家重点基础研究发展计划(No.2011CB911102);国家自然科学基金青年基金(No.11105216)资助

摘　　要：同步辐射是由同步辐射装置产生的宽光谱、高通量、高准直、高亮度的优质光源,在许多领域已得到广泛应用。同步辐射光束的光斑大小是其最为重要的特性之一。常规测量光斑大小的方法是采用狭缝或刀片扫描光束,然后根据光强变化计算出光斑的大小,这种方式准确度高,但过程繁琐、效率较低。同步辐射光束照射到荧光靶上会形成可见光光斑,通过安装在光束线上的共轴摄像头可以获取光斑的图像信息。本文提出一种基于图像处理的光斑提取方法,能够快速提取光斑大小并显示光斑中心的位置以及光斑的对称性。测试结果表明:该方法能够实时地获取同步辐射光斑特征信息,且光斑尺寸在一定范围变化时具有较高的准确性,在光束线调试过程中可以作为一种有效的辅助测量手段。Background： Synchrotron radiation is a special light produced by synchrotron radiation facility, and has been widely used in many fields because of its properties of broad spectrum, high brilliance and excellent collimation. The beam spot size is one important feature of the beamline. The current method used for measuring the spot size is scanning knife-edge technique, which is accurate but time consuming. Purpose： The aim is to find an effective method to get the spot sizes more quickly and more intuitively based on the image processing. Methods： Basic image processing method and adaptive threshold binarization method are employed to resolve the problem. Results： The results show that the image processing program can get the spot size correctly, although the spot size varies in a large range, and what＇s more, the new method can show the information about the spot center and spot symmetry simultaneously. Conclusion： The new method is faster and more intuitive compared with the others currently used and it can be considered as an effective diagnosis tool during beamline operation.

关 键 词：同步辐射光斑 实时分析 数字图像处理 直方图 自适应阈值 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置] TL271.7[自动化与计算机技术—控制科学与工程]