12 • 主平面 、主单元体、主应力 主平面 (Principal Planes): 切应力为零的截面。 主单元体(Principal body): 同时包含三个相互正交的 主平面 方 位的单元体。
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The formulas for determining the equivalent focal length, principal planes, focal planes as well as the GRIN lens law are derived.
导出透镜的等效焦距,主面、焦面位置以及高斯成象公式。
Starting from the ray path equation, object-image relationships are found and used to determine the equivalent focal length and the principal planes of tapered GRIN fiber.
本文从光线轨迹方程出发,推导了锥形梯度折射率纤维的物像关系式,并得出了它的等效焦距和主平面位置。
This paper advances a direct observational method to determine two principal planes corresponding with two principal stresses Belng simple and obvious, this method ean be mastered easily.
本文提出关于平面应力状态单元体上两个主平面与两个主应力对应关系的直观判断方法。
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