声速测量实验中多谐振频率点现象的分析  

Study of Multiple Resonance Frequency During the Sound Velocity Measurement Experiment

作　　者：王萌[2] 刘立英[1] 张瑞[2] 原安娟[1] 罗佳 WANG Meng;LIU Liying;ZHANG Rui;YUAN Anjuan;LUO Jia(Department of Science,Beijing University of Technology,Beijing 100124,China;Department of Materials Science,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学理学部,北京100124 [2]北京工业大学材制学部,北京100124

出　　处：《大学物理实验》2021年第5期26-29,共4页Physical Experiment of College

基　　金：北京工业大学本科教学改革项目。

摘　　要：流体中声速测量实验是大学物理实验的基本内容之一,通常采用共振干涉法和相位比较法测量超声波的波长。本文发现了测量过程中的多谐振频率点现象,系统研究了其影响因素并对其原因和物理意义进行了剖析。结果表明,不同介质及发射和接收器在不同距离条件下,均会影响谐振频率位置。基于不同谐振点现象的研究分析,引入系统共振频率概念,加深了对谐振频率及共振频率的理解和认识。The sound-velocity-measurement experiment is the basic content of college physics experiment.Resonance interferometry and phase comparison method are usually used to measure the wavelength of ultrasonic wave.The phenomenon of multiple resonant frequency points during the measurement process is found.The influencing factors and physical mechanism are systematically studied.The results show that different media and different distances between transmitter-receiver will affect the resonant frequency position obviously.Based on the research and analysis of different resonance points,the concept of system resonance frequency is introduced,which can understand the resonance frequency deeply.

关 键 词：声速测量 共振干涉法 相位比较法 谐振频率 共振频率 

分 类 号：O4-34[理学—物理]