文献类型：期刊文献

中文题名：超声波声速测量实验的拓展

英文题名：The Expansion of Ultrasonic Sound Velocity Measurement Experiment

作者：薛啸天[1];宋文韬[1];崔淦维[1];姚慧敏[1];朱云霞[1];高建平[1];罗锻斌[1]

机构：[1]华东理工大学物理系,上海200237

年份：2021

卷号：34

期号：2

起止页码：30

中文期刊名：大学物理实验

外文期刊名：Physical Experiment of College

基金：华东理工大学2019年本科教育教学方法改革研究项目;2019年度上海市重点课程课程建设项目(YK0126154)。

语种：中文

中文关键词：超声波;声速;驻波;声悬浮

外文关键词：ultrasonic;velocity;standing wave;acoustic levitation

摘要：对传统的声速测量实验内容进行了拓展,利用发射换能器和接收换能器构成的超声谐振腔形成的稳定驻波,演示了声辐射力与物体自身重力平衡时的声悬浮现象;在此基础上,利用泡沫小球的动态声悬浮过程对超声驻波的波长进行了测量,计算得到的声速结果与参考值的百分误差为2.1%。上述实验内容的拓展,让学生对超声波驻波场的产生、分布、力学效应有了更直观的认识和理解,也让学生在传统实验的基础上了解了声悬浮这一技术,不仅增加了学生的实验兴趣,而且扩大了学生的知识面与实验技能。
We extend the traditional experiment of sound velocity measurement.We use the stable standing wave formed by the ultrasonic cavity to demonstrate the acoustic levitation phenomenon when the acoustic radiation force is in balance with the gravity of the object.Basing on the above experiment,the wavelength of the standing wave is measured by the dynamic acoustic levitation process of the bubble ball,and the percentage error between the calculated sound velocity and the reference value is 2.1%.The expansion of the above experiment content enables students to have a more intuitive understanding of the generation,distribution and mechanical effect of ultrasonic standing wave field,and also enables students to understand the technology of acoustic suspension on the basis of traditional experiments,which not only increases students’interest in experiments,but also expands students’knowledge and experimental skills.