Yuan Yao, Yao Yang, Ang Ti, Yang Song, Jiamin Zhang, Yan Wang, Yao Zhang, Haiqing Liu, Y. Jie
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引用次数: 0
摘要
电子密度通常由激光辅助干涉仪来诊断。相位解调后得到的相位差信号会被包裹,这也被称为条纹跳跃。我们已经开发出一种方法,利用 FPGA 实时解除相位差信号的包裹,这种方法是专门为处理 EAST 超导托卡马克上的氰化氢(HCN)激光干涉仪中的条纹跳跃而设计的。该方法设计用于在前端使用快速傅立叶变换(FFT)方法的相位解调器。与现场可编程门阵列(FPGA)等复杂的数学分析算法相比,该方法更适合硬件实施。该方法已用于实时处理 EAST 上 HCN 激光干涉仪的相位测量结果。电子密度结果显示了对条纹跃迁解包方法的良好信心。此外,还讨论了在其他激光干涉仪上的进一步应用,如 EAST 上的激光干涉仪(POINT)系统。
A fringe jump counting method for the phase measurement in the HCN laser interferometer on EAST and its FPGA-based implementation
The electron density is usually diagnosed by the laser-aided interferometers. The phase difference signal obtained after phase demodulation is wrapped, which is also called fringe jump. A method has been developed to unwrap the phase difference signal in real-time by using FPGA, specifically designed to handle fringe jumps in the Hydrogen Cyanide (HCN) laser interferometer on the EAST superconducting tokamak. The method is designed for phase demodulator using the Fast Fourier Transform (FFT) method at the front end. The method is better adapted for hardware implementation compared to complex mathematical analysis algorithms, like Field Programmable Gate Array (FPGA). The method has been applied to process the phase measurement results of the HCN laser interferometer on EAST in real-time. Electron density results show a good confidence on the fringe jump unwrapping method. Further possible application on other laser interferometers, like the POlarimeter-INTerferometer (POINT) system on EAST is also discussed.
期刊介绍:
PST assists in advancing plasma science and technology by reporting important, novel, helpful and thought-provoking progress in this strongly multidisciplinary and interdisciplinary field, in a timely manner.
A Publication of the Institute of Plasma Physics, Chinese Academy of Sciences and the Chinese Society of Theoretical and Applied Mechanics.