相位比较法在声速测量中的应用-常州大学学报(自然科学版)

文章信息/Info

作者:: 曹建庆¹ ; 江兴方²; 1.常州信息职业技术学院基础课部, 江苏常州 213015 ;2.江苏石油化工学院信息科学系, 江苏常州 213016

Author(s):: CAO Jian -qing¹ ; JIANG Xing -fang²; 1 .Department of General Courses , Changzhou Insti tute of Info rmation Technology , Changzhou 213015 , China ;2 .Department of Information Science , Jiangsu Insti tute of Pet rochemical Technology , Changzhou 213016 , China

Keywords:: standing w ave ; phase ; double -trace oscilloscope ; sound velocity measuring apparatus

摘要:: 介绍了在声速测定实验中利用声速测定仪、双踪示波器、低频信号发生器等实验仪器, 提出了测量声驻波相位的一种直观方法, 采用信号发生器发出的信号直接输入Y 1, 将接收器接收到的信号输入Y 2 , X 轴仍输入扫描信号。在测量声压驻波振幅变化规律的同时与原信号的相位进行比较, 可看到相位发生变化的规律。从而证实驻波相位的特点, 在相邻2 个波节间的各点同相, 而位于1 个波节的2 侧的2 点反相。用李萨如图形法测量声速误差较小。

Abstract:: This paper puts forward a method in the experiment of measuring sound veloci ty w ith sound velocity measuring apparatus , double -trace oscillograph , and low f requency signal generator .In the method it puts the sign f rom low frequency signal generator into Y 1 of double -t race oscillog raph .It puts the sig n f rom receiver of sound velocity measuring apparatus into Y 2 of double -trace oscillograph .The sign X is a scan sig n .We can view the t ransformation law of the phase of the sound standing w ave in the experiment .All the points between the tw o nodes are in the same phase .The tw o points on the tw o sides of a node are in reverse phase .The experiment erro r of sound velocity measuring is very small w ith lissajous figures