关于相位比较法测声速的研究

On Sound Velocity Measuring of Phase Comparison Method

声速测定实验因为涉及到多种理论和实验方法的结合,从而成为力热实验中的一个重要的综合性实验。论文严格推导出声位移驻波的波节附近的声压驻波可以化为一行波,从而实现从驻波场中经换能片输出一行波,通过比较其相位测定声速。解释了声速测定实验中长期存在的疑惑,通过实验测量验证了理论推导结果的正确性。

Due to involve the combination of a variety of theoretical and experimental methods, Sound velocity measurement thus becoming an important comprehensive experiment of university physics experiment even mechanics and heat experiments.The paper rigorously derived that an acoustic pressure wave nearby nodes of acoustic displacement wave could be translated to a traveling wave,thus to measure the sound speed through comparing the phases after outputting an traveling wave sign from the standing wave field.The paper explains the long-term existence of the sound velocity measurement experiment.Finally, we have verified that the correction of our theoretical deduction by experimental measurement.