基于马吕斯定律测量转动惯量  

Measuring moment of inertia based on Malus’law

作　　者：许琪 盛佳南[2] XU Qi;SHENG Jianan(School of Electronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China;Physics Experiment Center,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学电子工程学院,四川成都610225 [2]成都信息工程大学物理实验中心,四川成都610225

出　　处：《物理实验》2024年第7期52-55,共4页Physics Experimentation

摘　　要：基于三线摆法测量物体的转动惯量原理,结合马吕斯定律,改进了传统的三线摆周期测量方法,设计了基于马吕斯定律的三线摆转动惯量测量实验装置.通过测量光信号的变化周期间接测量三线摆的摆动周期,借助数字示波器采集实验数据,结合实验数据的离散特性,使用Origin软件对示波器导出的csv文件进行绘图和快速傅里叶变换低通滤波,由C语言程序对Origin软件导出的txt文件进行读取和平均周期计算,得到较为准确的转动惯量.Based on the principle of measuring the moment of inertia of an object by the three-wire pendulum method,combined with Malus’law,the swing period of the three-wire pendulum was measured indirectly by measuring the period change of the light signal,which was an improvement based on the traditional method.A three-wire pendulum device based on Malus’law was designed to measure moment of inertia,and the experimental data were acquired with the help of a digital oscilloscope.Due to the discrete characteristics of the experimental data,the csv file exported from the oscilloscope was used for data plotting and FFT low-pass filtering,as well as interpolation and intersection,and a C language program was written to read the txt file exported from Origin and calculate the average period,so as to get the relatively accurate moment of inertia.

关 键 词：转动惯量 三线摆 马吕斯定律 FFT低通滤波 

分 类 号：O313.3[理学—一般力学与力学基础] O436.3[理学—力学]