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介绍了用光截面法在线检测型材截面尺寸时的三维误差分析，应用摄动法建立了三维误差的数学模型，并进行了仿真计算。根据计算结果及其分析，给出了检测系统测量装置的设计参数。
This paper introduces the three-dimensional error analysis of cross-sectional dimension of profile by light cross-section method. The mathematical model of three-dimensional error is established by using perturbation method, and the simulation calculation is carried out. According to the calculation result and its analysis, the design parameters of the measuring system of the measuring system are given.