Hanning窗插值FFT算法在涡街信号处理中应用的可行性分析

Feasibility Analysis of Applying Hanning Window Interpolation Algorithm to Signal Processing of Vortex Flowmeter

涡街信号频率和流速的关系一直是流量测量的理论基础。脉冲计数的频率测量方法容易受到干扰信号的影响而导致测量不准确。为了克服该难题,采用离散频率分析测量涡街频率。但由于离散频谱分析会受到栅栏效应的影响,其频率测量精度不高。虽然延长采样时间可以提高频率测量精度,但是系统的运行效率会降低。因此考虑将Hanning窗插值FFT算法应用到涡街频率的测量中,分析了其可行性,并对其测量精度进行实验验证。

This paper measures the vortex frequency with discrete spectrum analysis.However,since the discrete spectrum analysis is influenced by the fence effect,the frequency measurement accuracy is poor.The method of extending sampling time can improve the frequency measurement accuracy,but the operating efficiency of the system will be reduced.This paper considers applying the Hanning window interpolation FFT algorithm to measuring the vortex frequency.