导出透镜的等效焦距，主面、焦面位置以及高斯成象公式。
The formulas for determining the equivalent focal length, principal planes, focal planes as well as the GRIN lens law are derived.
试验结果表明，所设计的系统能够依据图像判断最优焦面位置，满足设计和测试要求。
The experiment results show that the optimal focus can be acquired and the detective method satisfies the test requirement.
在CCD相机的研制工作中，需要将多个CCD安置于CCD相机的焦面位置处，并使各CCD像元之间相对于相机焦面的共焦偏差满足相机设计要求。
In the development of CCD camera, more than two pieces of CCD should be put into the focal plane of the camera. The focus error would be less than the requirement of design.
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.
本文介绍一种新的焦面检测方法，以位置敏感探测器PSD作为检焦器件对光学系统的实际焦面进行检测。
A new technique for measuring the accurate position of the focal plane of an optical system with position sensitive detector (PSD) is presented.
线长变化后，焦线宽度、光强分布均匀性、靶面位置仍然不变。
After the line length varied, the width, intensity distribution along the line length, and the target position are still unchanged.
线长变化后，焦线宽度、光强分布均匀性、靶面位置仍然不变。
After the line length varied, the width, intensity distribution along the line length, and the target position are still unchanged.
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