关键词: 相位比较, 傅里叶变换法, 激光干涉测量, 电子密度

Abstract:

A new phase comparator technique, called FFT, was introduced and applied successfully to the calculation of electron density ne for the interferometer data on the HL-2A tokamak. After calculating a great number of the experimental data and comparing the results with another two old methods: hardware and conventional software, the correctness and reliability of FFT have been affirmed. FFT can not only give the electron density curve in truth, but also overcome the jump and excursion of density curve at a certain extent. Whereas, without real-time calculation is its own defect.

Key words: Phase comparator, FFT, Laser interferometer, Electron density