In this article, we describe the effects and the degree to which they cause error in the measurement of propagation velocity. Various effects include nonlinearity in path measurement, temperature stability and number of maxima or minima consideration. Double-distilled water was used as a sample to estimate various effects. Finally, it has been concluded that the variable frequency approach may be preferred for better accuracy. It has also been observed that the digital frequency selection is more precise than mechanical distance variation.

中文翻译：

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液体变径超声干涉仪中传播速度的准确估计

在本文中，我们描述了影响以及它们在传播速度测量中引起误差的程度。各种影响包括路径测量中的非线性，温度稳定性以及考虑的最大值或最小值。使用双蒸馏水作为样品来评估各种影响。最后，得出的结论是，为了获得更好的精度，可能首选变频方法。还已经观察到，数字频率选择比机械距离变化更精确。