介绍了一种用于测量弹丸转动惯量的高精度测量仪器 ,该仪器利用双悬丝扭摆机构、光电计时系统提取摆动周期信息 ,由MCS 51系列单片机组成的测量系统进行数据处理 ,并由LED显示器测量结果。文中阐述了仪器的工作原理 ,推导了所需的计算公式 ,分析了产生测量误差的因素 ,进行了定量精度分析 ,给出了实验结果与测量精度 A measuring instrument for measuring the moment of inertia of the projectile is introduced. The instrument uses the double - wire torsion mechanism and the photoelectric timing system to extract the information of the wobble cycle. The data is processed by a measuring system consisting of MCS 51 series of singlechip and processed by the LED display Measurement results. The article describes the working principle of the instrument, derives the required calculation formula, analyzes the factors that cause the measurement error, analyzes the quantitative accuracy, and gives the experimental results and measurement accuracy