摘要：声速是指声波在介质中传播的速度，其大小因介质的状态与性质而不同，而且随介质的温度、压强等状态量而改变。声速的应用领域极其广阔，声速不仅在声学研究中具有重要作用，还在很多学科中得到应用。在人类的生产生活中扮演着很重要的角色。另外，对声波特性（频率、波速、波长、相位、振幅等）的测量是研究声学技术的重要部分。声速的测量在声波探伤、测量距离、定位、显示等方面都有重要的意义。为此，对不同介质中声速的测量进行对比研究是非常有必要的。为了研究不同介质中的声速，本文采用驻波法和相位比较法进行了实验测量，对空气、淡水、糖水、盐水四种介质声速的测量进行了对比研究，研究结果发现声速在空气、淡水、盐水、糖水等四种介质中传播时，在糖水中声速最大，在空气中声速最小。48845

毕业论文关键词：声速；声速的测量；对比研究

Comparative Study Measuring The Speed of Sound in Different Media

Abstract: Refers to the speed of sound propagation of acoustic waves in a medium speed, due to its size and nature of the state of the medium is different, and with the medium temperature, pressure and other state quantity changes. The speed of sound is extremely broad field of applications, the speed of sound is not only an important role in acoustic research, still in many disciplines in the applications. It plays a very important role in the production of human life. In addition, the acoustic characteristics (frequency, wavelength, wave velocity, phase, etc.) is an important measurement of acoustic technology. Measured in terms of acoustic detection, ranging, locate and display the speed of sound has an important significance. To this end, the speed of sound in different media measurement comparative study is necessary. In order to study the speed of sound in different media, we use standing wave method and the phase comparator method of experimental measurements of air, water, sugar, salt four kinds of media sound velocity measurements were compared, the researchers found that the speed of sound in air, water, when salt, sugar and other four media spread, the maximum speed of sound in the sugar, the minimum speed of sound in air.

Key Words: Speed of sound ;Measuring the speed of sound ;Comparative Study

目录

摘要 1

引言 2

1. 实验原理 2

1.1 共振干涉法(驻波法)测声速的原理 2

1.2 相位比较法测量原理 4

2. 实验过程 5

2.1 实验装置 5

2.2 确定振动系统的共振频率 6

2.3 驻波共振法测量声速 6

2.4 相位比较法测量声速 6

2.5 测量液体声速 7

3. 实验数据 7

3.1 最佳工作频率 7

3.2 空气中的声速测量 7

3.3 水中的声速测量 8

3.4 盐水中的声速测量 8

3.5 糖水中的声速测量 9

4. 数据处理 9

4.1 空气中声速的测量 9

4.2 淡水中声速的测量 11

4.3 盐水中声速的测量 12

4.4 糖水中声速的测量