利用数字示波器测量空气中的超声速  

Measurement of Ultrasonic Velocity in Air Using Digital Oscilloscope

作　　者：彭智伟 梁鸿东[1] 张姗 陈滢 沈毅强 Peng Zhiwei;Liang Hongdong;Zhang Shan;Chen Ying;Shen Yiqiang(School of Physics and Materials Science,Guangzhou University,Guangzhou,Guangdong 510006)

机构地区：[1]广州大学物理与材料科学学院,广东广州510006

出　　处：《物理通报》2022年第8期116-119,125,共5页Physics Bulletin

基　　金：广州大学2021年度校级在线开放课程立项建设项目.

摘　　要：利用数字示波器,采用驻波法、相位比较法、时差法测量了空气中的超声速.测量的结果准确度高,相对误差较小.数字示波器的自动测量功能可显示峰峰值、相位差,光标测量功能可测量时间差.这些功能为测量空气中的超声速带来了便利,同时使测量准确度得到提升.Using digital oscilloscope,the ultrasonic velocity in air was measured by standing wave method,phase comparison method and time difference method.The measurement results have high accuracy and small relative errors.The automatic measurement function of digital oscilloscope can display peak-to-peak value and phase difference,and the cursor measurement function can measure time difference.These functions facilitate the measurement of ultrasonic velocity in air and improve the measurement accuracy.

关 键 词：数字示波器 驻波法 相位比较法 时差法 声速 

分 类 号：O422.1[理学—声学] TM935.37[理学—物理]