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 oscillo-scope.Due to the discrete characteristics of the experimental data,the csv file exported from the oscil-loscope was used for data plotting and FFT low-pass filtering,as well as interpolation and intersec-tion,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.
moment of inertiathree-line pendulumMalus'lawFFT low-pass filtering
万方数据
维普
