圆锥曲线上任意一点M与圆锥曲线焦点的连线段,叫做圆锥曲线焦半径。圆锥曲线上一点到焦点的距离,不是定值。焦半径:曲线上任意一点与焦点的连线段焦点弦,过一个焦点的弦通径。过焦点并垂直于轴的弦圆锥曲线(除圆外)中,过焦点并垂直于轴的弦。
基于点扩展函数,推导出共焦系统的成像公式,模拟了探测器尺寸对分辨率的影响,并提出最佳针孔半径。
The imaging equations are derived based on point spread function, the influence of detector on resolution is simulated, and the optimum pinhole radius is proposed.
分析表明,焦移的大小与菲涅尔数、透镜-光阑的分离程度以及入射波波面曲率半径等因素有关,并得出了消除焦移的条件。
The analysis that the size of the focal shift is related to the factors such as Fresnel number, separating degree of lens-diaphragm and curvature radius of incident wave wavefront, etc.
详细描述了神光装置激光聚变物理实验靶瞄准定位系统的原理和结构,提出了“空间坐标法”进行靶定位和靶瞄准,利用“离焦定半径”完成了激光调焦。
We use a space coordinate method to position and point the target and align the laser beam, and use an off-focus radius-finding technique to find the laser focus.
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