影响离轴抛物镜准直特性的主要因素有离轴量，有效孔径和焦面出射点的位置。
The basic factors affecting collimating characteristic are off-axis magnitude, effective aperture and emission position on the focal plane of off-axis parabolic mirror.
以面阵CCD为传感器，检测光纤端部出射光斑，采用“重心法”提取光斑的特征点表征光纤的位置。
With planar array CCD sensor, exit spot from optic fiber end is detected through extracting the characteristic points of spot for characterizing the position of optic fiber.
当入射光束与出射光束平行时，单色同心光学系统空间任一点成几何理想像。
If a monocentric system existed for which an incident collimated beam emerged as exactly collimated, then the system would give geometrically perfect imaging of any point in space.
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