| 声速测量原理中的两个问题 |
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| 引用本文： | 刘香茹,曹万民,巩晓阳. 声速测量原理中的两个问题[J]. 河南科技大学学报(自然科学版), 2001, 22(3): 86-89 |
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| 作者姓名： | 刘香茹 曹万民 巩晓阳 |
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| 作者单位： | 洛阳工学院数量系 |
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| 摘 要： | 指出声速测量原理中存在两个令人困扰的问题 :用共振干涉法进行测量时 ,两换能器表面处空气质元皆为驻波的波节 ,系统的震动如何被激发 ;目前是大学物理实验教材中关于声速测量的共振干涉法和相位比较法实验原理存在内在的矛盾。通过对实际情况作适当近似 (忽略媒质对声波的吸收 ,且反射皆为全反射 ) ,求解波动方程 ,给出了两种方法所测电压信号的具体形式 ,由此指明两种实验方法各自的实验依据 ,解决了原有的问题
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| 关 键 词： | 声速测量 共振干涉法 相位比较法 声波 反射波 |
| 文章编号： | 1000-5080(2001)03-0086-04 |
| 修稿时间： | 2001-03-20 |
Two Problem About the Principle of Measuting the Speed of Sound |
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| LIU Xiang Ru,CAO Wan Min,GONG Xiao Yang. Two Problem About the Principle of Measuting the Speed of Sound[J]. Journal of Henan University of Science & Technology:Natural Science, 2001, 22(3): 86-89 |
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| Authors: | LIU Xiang Ru CAO Wan Min GONG Xiao Yang |
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| Abstract: | There are two doubts in the experiment of measuring the speed of sound:the air particles near to the two energy transposers are always nodes of the standing wave,then how the vibrate of the system can be caused.The most serious one is that the method of resonant interference is contrary to the method of phases in the experiment principle in many teaching materials.The practical form of voltage signals for the two methods is given by solving the wave equation(neglect the absorbtion of the medium,and the wave is totally reflected every time),so that the foundations of the two methods have been pointed out,and the problems have been solved. |
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| Keywords: | Sonic velocity measurement The method of resonant interference The method of phases Sound waves Reflected waves |
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