超声波多普勒效应实验中异常信号来源的分析与实验研究
Analysis and Experimental Study of the Abnormal Signal in Ultrasonic Doppler Effect Experiment
范磊 1赵婧茹 1黄昱荣 1穆翠玲1
作者信息
- 1. 中山大学 物理与天文学院,广东 珠海 519082
- 折叠
摘要
在超声波多普勒效应实验中发现接收器会接收到来自其超声波源的异常信号.为解释这一现象,从声波传输路径出发,假设了两种信号形成的可能路径,分别开展了物理建模分析和实验验证.最终证明实验中的异常信号源于相邻超声波源经天花板和地面的反射.进一步从理论和实验上验证了正常实验中相邻实验不会影响本地的测量结果.在面对特殊物理现象时,引导学生利用"实验现象-提出问题-提出猜想-建模分析-实验验证"的研究范式,最终解释了实验现象,训练了学生的实验思维,提高了学生解决问题的能力.
Abstract
In an ultrasonic Doppler effect experiment,an abnormal signal from other ultrasonic sources was collected by the local receiver.To explain this phenomenon,firstly,two possible paths of the signals were hypothesized,and the corresponding physical models proposed.Experiments were then carried out respectively to verify the models.It was proved that the abnormal signal in the experiment originated from the reflection of sound waves coming from adjacent ultrasonic wave sources through the ceiling and the ground.Finally,it was clarified that the local measured results would not be interfered by the adjacent experiments,by both of theory and experiment.It demonstrates the paradigm of"phenomenon-questions-conjecture-modeling-verification"in our experiment teaching to guide and inspire students to question and to solve problems.While explaining phenomena,students'experimental thinking was trained and their problem-solving ability was improved.
关键词
多普勒效应/超声波传输/物理建模/大学物理实验Key words
doppler effect/ultrasonic transmission/physical modeling/university physics experiment引用本文复制引用
出版年
2024
NETL
NSTL
万方数据