基于短时能量和线性拟合的泄漏信号传播速度测量方法

Measurement Methods for Leakage Signals Propagation Speed Based on Short-term Energy and Linear Fitting

提出基于短时能量和线性拟合的测量方法(简称短时能量法),能较准确地确定两个压电传感器输出信号的起始点,将这两个起始点对应的时间差作为信号的传播时间,再对不同传播距离下的平均传播时间进行线性拟合得到声速,从而减小了声速的测量误差。通过线性拟合度r-square来定量评价该方法的有效性,并与互相关方法和自适应方法进行了比较。

A short-time energy and linear fitting-based sound speed measurement method （called the shorttime energy method for short） was proposed, which has the signals＇ starting points at two piezoelectric sensors determined more accurately, and the time difference corresponding to the two starting points taken as the propagation time and the sound speed obtained by linearly fitting the propagation time for different propagation distances to reduce the measurement error of the sound speed. Having linear fit r-square used to evaluate the effectiveness of this method and then comparing it with cross-correlation and adaptive algorithms were implemented.