FPGA implementation of digital phase difference measurement on far-infrared laser interferometer
FIR laser interferometer is a key equipment for plasma electron density measurement on nuclear fusion devices.To achieve accurate measurement of electron density signals in the FIR laser interferometer,a hardware layer real-time processing framework for the digital phase difference measurement algorithm on the FIR laser interferometer is designed.Verification is conducted based on an AD9269 signal acquisition module with a sampling rate of 20 MSPS and a Xilinx K7 series programmable logic array device with a clock frequency of 125 MHz.The field test results show that the measurement delay of this digital phase difference algorithm is 64 μs,the final phase difference measurement accuracy can be controlled within 0.1°,and the time resolution of the measurement results is 50 ns.
NETL
NSTL
万方数据
维普
