上海光源BL14W1线站透射XAFS数据采集系统升级  

Upgrade of transmission XAFS data acquisition system upgrade of Shanghai Synchrotron Radiation Facility BL14W1 beamline station

作　　者：刘泓舟 李季 顾颂琦[2,3,4] 苏晓智 梅丙宝 姜政 刘志[1,4] LIU Hongzhou;LI Ji;GU Songqi;SU Xiaozhi;MEI Bingbao;JIANG Zheng;LIU Zhi(ShanghaiTech University,Shanghai 201210,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China)

机构地区：[1]上海科技大学,上海201210 [2]中国科学院上海应用物理研究所,上海201800 [3]中国科学院大学,北京100049 [4]中国科学院上海高等研究院上海光源科学中心,上海201204

出　　处：《核技术》2022年第7期27-35,共9页Nuclear Techniques

基　　金：国家重点研发计划"催化科学"重点专项(No.2021YFA1500502);国家自然科学基金(No.U1732267)资助。

摘　　要：X射线吸收光谱(X-ray Absorption Spectroscopy,XAS)在材料科学、生物学、化学等领域有着广泛的应用。为了提高上海光源BL14W1光束线站同步辐射X射线吸收精细结构谱(X-ray Absorption Fine Structure spectroscopy,XAFS)的透射数据采集的效率,搭建了基于分布式数据采集节点和XAFS测试多样品架的数据采集系统。分布式数据采集节点采用了集成式设计,开放了底层系统,能够直接获取电压信号和编码器信号,并具有体积小、噪音小、成本低、易于维护等优点;XAFS测试多样品架提供了12个样品孔位,并可以远程控制其孔位切换。将两个硬件设备相结合搭建出新型数据采集系统,并提供了多样品自动筛选采谱的功能。采用LabVIEW编写的新数据采集系统与自动筛选采谱程序实现了多样品XAFS的自动筛选及高信噪比自动采集,大大提高了数据采集的效率,为整个线站的运行带来采谱效率大幅提高、成本降低、维护难度降低、占用空间减小等多方面的提升。[Background]X-ray absorption spectroscopy(XAS)has a wide range of applications in materials science,biology,chemistry and other fields.[Purpose]This study aims to improve the efficiency of transmission acquisition of synchrotron X-ray absorption fine structure spectroscopy(XAFS)at the BL14W1 beamline station of Shanghai Synchrotron Radiation Facility(SSRF).[Methods]A transmission XAFS data acquisition(DAQ)system based on distributed data acquisition nodes and XAFS test multi-sample racks was built.An integrated design and open the underlying system were applied to the distributed data acquisition nodes for direct acquisition of voltage signals and encoder signals with advantages of small size,low noise,low cost,and easy maintenance.Twelve sample holes were provided by the XAFS test multi-sample holder which could be remotely controlled to switch the hole positions.A new data acquisition system was built by combining the two hardware devices to provide functionalities such as automatic screening and spectrum collection of multiple samples.Both the new data acquisition system and the automatic screening spectrum acquisition program were written in LabVIEW.[Results]The new data acquisition system realizes the high signal-to-noise ratio automatic screening and automatic acquisition of multi-sample XAFS,which greatly improves the efficiency of data acquisition.[Conclusions]The upgrade of the DAQ system for SSRF BL14W1 beamline greatly improve the spectrum collection efficiency,reduce the cost,reduce the maintenance difficulty,and reduce the occupied space for the operation of the line station.

关 键 词：同步辐射 数据采集 X射线吸收精细结构谱 LABVIEW 

分 类 号：TL99[核科学技术—核技术及应用]