小波阈值滤波在涡街流量计信号处理中的应用

Application on Wavelet Threshold Filter in Signal Processing of Vortex Flowmeter

涡街流量计由于其特有的优点而得到了广泛应用,但低流量时涡街信号的提取一直是一个难题.根据小波变换和涡街流量计输出信号的特点,采用小波阈值滤波法对涡街流量计信号进行处理,并提出了一种改进的小波阈值选取方法.分析和仿真结果表明小波阈值滤波算法对涡街信号提取和噪声去除效果良好.

The vortex flowmeter is widely used because of its particular advantages. But the acquirement and measurement of vortex flowmeter signals in low velocity have not been resolved yet. Based on the features of wavelet transformation and signals of vortex flowmeter, the wavelet threshold filtering method is used to process signals of vortex flowmeter. An improved threshold selection method is proposed. The results from analysis and simulation show threshold filtering algorithm is effective to separate the signals of vortex flowmeter from noises.