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本文提出一种用全息光栅作为标准器进行圆度测量的原理与装置，该装置可用计算机显示圆度误差图形，并用最小二乘法和最小区域法评定圆度误差。
In this paper, a principle and device for roundness measurement using holographic grating as a standard instrument are proposed. The device can display the roundness error graph by computer and evaluate the roundness error by the least square method and the minimum area method.