扭摆法测物体转动惯量的不确定度分析  

Analysis on the Uncertainty of Rotational Inertia by Method of Torsion Pendulum

作　　者：马亚林[1] 陈建新[2] 

机构地区：[1]淮阴工学院,江苏淮安223003 [2]南通大学,江苏南通226019

出　　处：《大学物理实验》2011年第1期93-96,共4页Physical Experiment of College

摘　　要：扭摆法是测量物体转动惯量的有效方法,其不确定度分析是关键。本文推导了扭摆法测物体转动惯量准确的不确定度传递公式,得到各直接测量量及其不确定度对转动惯量不确定度的影响,并进行了算例分析。结果表明,扭摆法比三线摆测得物体的转动惯量的误差以及不确定度要小很多,这对实验方法的选择和仪器的研制具有重要的实际意义。The method of torsion pendulum is an effective method to measure rotational inertia,the key of which is the analysis of the corresponding uncertainty.The accurate transfer formula of uncertainty of torsion pendulum method was deduced,the influences of the direct measurements and the corresponding uncertainty on the uncertainty of rotational inertia were obtained,and the calculation examples were given.The result shows that the error and uncertainty of rotational inertia measured by the method of torsion pendulum is much less than which measured by the method of three-wire pendulum,which have importantly practical significance to choosing experimental methods and developing laboratory instruments.

关 键 词：扭摆法 转动惯量 不确定度 

分 类 号：O4-34[理学—物理]