The basic factors affecting collimating characteristic are off-axis magnitude, effective aperture and emission position on the focal plane of off-axis parabolic mirror.
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 position of the image and the amplitude variation in the optical field are associated with the focus and the distance from the object to the front focal plane of the lens system.
象的空间位置和光场振幅的变化与透镜系统的焦距以及物体距焦平面的位置有关。
A new technique for measuring the accurate position of the focal plane of an optical system with position sensitive detector (PSD) is presented.
本文介绍一种新的焦面检测方法，以位置敏感探测器P SD作为检焦器件对光学系统的实际焦面进行检测。
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