采用相位法与极大值法测量超声波声速的准确度的研究

Discuss accuracy question about measuring wavelength for ultrasonic velocity definite using phase method or extreme value method

对极值法和相位法测量超声波声速的准确度问题进行了研究,实验与理论分析证明:相位法测量波长比极值法准确度要高.在与简谐运动有关的测量中,测量最大变化率点常常比测量最大值点的准确度要高,这在其他物理实验中也适用.

In the experiment for measuring ultrasonic velocity, the accuracy in measureing wavelength by extreme value method or phase method are discussed, through experiment and theory＇ analysis, it is proved that accuracy of phase method is better than that of extreme value method in measure wavelength at one time, it is better to measure an extreme value rate point than a extreme value point.