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对管道内表面，通过成像系统在乎面上成像，给出其物像之间几何形状相似的判定标准，并对平面反射镜、圆锥反射镜和离轴球面反射镜在平面上成像的几何形状进行了详细的分析。从而得出离轴球面反射镜所成图像畸变最小。
The inner surface of the pipe is imaged by the imaging system on its surface to give a criterion of geometric similarity between the object images and the geometry of the planar mirror, conical mirror and off-axis spherical mirror in the plane of imaging A detailed analysis. The result is that the off-axis spherical mirror has the smallest image distortion.