center of a lens是什么意思

用法例句

In order to test the thickness of lens center conveniently, this paper introduces a photoelectric instrument to measure the thickness by interference method and introduces the principle of this test method.

　透镜中心厚度是光学系统中的一个重要参数,其加工精度直接影响光学系统的成像质量。

Correcting the accuracy of non rotating and aspheric lens by controlling the pressure of the polishing die;

自由曲面透镜型面误差的压力抛光修正

The surgery of rhegmatogenous retinal detachment under indirect ophthalmoscope with no hand-held condensing lens;

无手持聚光透镜间接检眼镜下视网膜脱离手术

Selfoc lenses and their application to optical fiber sensing system;

自聚焦透镜及其在光纤传感系统中的应用

The phase computing formula and designing way for the air three-dimensional Rotman lenses are presented.

介绍了二维多波束天线的特点和实现二维多波束的几种方法 ,针对空馈的Rotman透镜推导出了由它馈电的平面天线阵的相位计算公式及设计方法 ,在此基础上成功地实现了空馈透镜的平面天线阵样机 ,并给出了相应的测试结果。