Abstract: HCN signal can be used for measuring the plasma electron density. HCN interferometers and phase comparators are used in HT-7 tokamak for supplying HCN signal. According to the analysis of the signal, an HCN signal processing algorithm is designed, which includes baseline offset elimination, HCN signal overturn processing, and denoising with fuzzy logic filter method. Using the proposed algorithm, plasma electron density signals with high accuracy and low noise have been obtained in HT-7 tokamak experiment.

Key words: HT-7 tokamak, HCN signal, Fuzzy logic algorithm, Filtering processing

摘要： 通过HCN信号的测量与处理来获得等离子体电子密度。采用硬件相位差计获取HT-7装置中原始HCN信号，根据对该信号特点的分析, 设计出信号去零漂、信号翻转、基于模糊逻辑的去噪处理算法。在HT-7装置实验中，使用该算法获得了较高精度的低噪音等离子体电子密度。

关键词: HT-7装置, HCN信号, 模糊逻辑算法, 滤波处理