基于离散小波变换的气固两相流参数检测

摘要

Aiming at the disadvantage of the unevenly distributed sensitive field of the traditional capacitive sensor,the double-deck spiral plate capacitive sensor was designed,and the structural parameters of sensor which impact the sensitive field distribu-tion were analyzed through the finite element simulation.The related time delay algorithm based on discrete wavelet transform was proposed,which improved the traditional cross correlation algorithm.This method was applied to gas-solid two-phase flow rate meas-urement,and the measurement results were compared with the traditional.Compared with the traditional method of delay algorithm, results show that the correlation delay algorithm based on discrete wavelet transformation has a stronger ability to suppress signal noise.Therefore,this method can accurately estimates the time delay under low SNR.%针对传统电容式传感器灵敏场分布不均匀的缺点，设计了双层螺旋电极电容式传感器，并且通过有限元仿真分析传感器结构参数对灵敏场分布的影响。对传统的相关时延估计算法进行了改进，提出了基于离散小波变换的相关时延算法，并将其应用到气固两相流速度测量当中，将两种算法测量结果进行了对比。实验证明，与传统的时延算法相比，基于离散小变换的相关时延算法具有更强的压制信号噪音能力，在低信噪比情况下也能准确进行时延估计。