首页|A fringe jump counting method for the phase measurement in the HCN laser interferometer on EAST and its FPGA-based implementation

A fringe jump counting method for the phase measurement in the HCN laser interferometer on EAST and its FPGA-based implementation

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Electron density in fusion plasma is usually diagnosed using laser-aided interferometers.The phase difference signal obtained after phase demodulation is wrapped,which is also called a fringe jump.A method has been developed to unwrap the phase difference signal in real time using FPGA,specifically designed to handle fringe jumps in the hydrogen cyanide(HCN)laser interferometer on the EAST superconducting tokamak.This method is designed for a 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,such as field programmable gate array(FPGA).It has been applied to process the phase measurement results of the HCN laser interferometer on EAST in real time.Electron density results show good confidence in the fringe jump unwrapping method.Further possible application in other laser interferometers,such as the POlarimeter-INTerferometer(POINT)system on EAST tokamak is also discussed.

electron densitylaser-aided interferometerfringe jump unwrappingFPGAEAST

姚远、杨曜、提昂、宋扬、张家敏、王琰、张耀、刘海庆、揭银先

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Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People's Republic of China

Anhui Electrical Engineering Professional Technique College,Hefei 230022,People's Republic of China

Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,People's Republic of China

Comprehensive Research Facility for Fusion Technology Program of ChinaHFIPS Director's FundAnhui Provincial Major Science and Technology ProjectTask JB22001 from the Anhui Provincial Department of Economic and Information Technology

2018-000052-73-01-001228YZJJKX2023012023z020004

2024

10.1088/2058-6272/ad0dec

等离子体科学和技术(英文版)
中国科学院合肥物质科学研究所 中国力学学会

等离子体科学和技术(英文版)

EI
影响因子：0.297
ISSN：1009-0630
年,卷(期)：2024.26(4)
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