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.
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