高精度同步数据获取系统的研制

Research and design of high precision synchronization data acquisition system

在磁铁电源研制等多种应用场合需同步测量多个信号,同时要求测量数据要有较高的精度。利用高精度模数转换器AD7960实现高精度数据获取,使用可编程门阵列(Field-Programmable Gate Array,FPGA)进行逻辑控制实现同步触发控制,研制出了高分辨率同步数据获取系统。分别针对高精度和同步性能进行测试和分析,得出系统的实际有效分辨率高于18位,并验证了系统能够实现高性能的同步数据采集。结合实际应用,进一步验证了系统的性能优势。

Background： Shanghai Synchrotron Radiation Facility （SSRF） is an advanced third-generation synchrotron radiation electron accelerator. The synchrotron radiation devices require the magnets and magnet power supply of high performance, such as high precision and high stability. In the design of a magnet and a magnet power supply, the flux and current signals is required to be measured simultaneously. Purpose： In order to simultaneously measure the two signals with high precision, a high precision synchronization data acquisition system should be designed and implemented. Methods： An 18-bits, 5 MSPS analog to digital converter of AD7960 is used to realize the high precision data acquisition. The synchronizing trigger signal is produced by Field-Programmable Gate Array （FPGA）, which is used to generate the control logic. Results： After the test of effective precision of Analog Digital Converter （ADC） and the synchronization performance, it is resulted that the effective precision of this system is better than 18 bits, and the performance of synchronization is great. Conclusion： The system proposed in this paper satisfies requirements of high precision synchronization data acquisition for SSRF.