A method for measuring the propagation time of an acoustic signal in a liquid by the detection of the zero point by means of gear of the signal

• 1. 用声音信号零交叉测量声音信号在流体中传播时间的方法 [P] . 中国专利： CN1221487A . 1999-06-30
• 2. 一种超声波信号传播时间的双阈值检测电路及检测方法 [P] . 中国专利： CN105300508B . 2018.05.01
• 3. Method of measuring the propagation time of an acoustic signal in a fluid for the passage to zero of the acoustic signal [P] . 法国专利： FR2749652B1 . 1998-08-21

  机译： 测量声音信号在流体中传播到零的时间的方法

• 4. METHOD FOR MEASURING THE TIME OF PROPAGATION OF AN ACOUSTIC SIGNAL IN A FLUID BY ZERO PASSING OF SAID ACOUSTIC SIGNAL [P] . 法国专利： FR2749652A1 . 1997-12-12

  机译： 零声信号通过声波测量流体中声信号传播时间的方法

• 5. Acoustic signal propagation time measuring method uses intersection of tangent to maximum gradient point of first half wave with zero line as time reference point [P] . 德国专利： DE10106308C1 . 2002-07-11

  机译： 声波信号传播时间的测量方法以切线与前半波最大斜率的交点为零线作为时间参考点

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• 6. Research on High Accuracy Zero Cross Time Detection Method of Power-frequency AC Signals [O] . Ming LEI, Yue GUO, Xin ZHENG, 2017

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