彗差

推导结果表明，piston误差对系统的影响最大，其次是离焦误差、倾斜误差、球差、彗差和像散。

The derivation result shows that the most sensitive aberration is piston error , and then the defocusing error , tilt error , spherical aberration , coma and astigmatism .

对于大偏转角五级彗差和像散的校正，应在Dilemma和Trilemma常数均为0或较小值时，通过调整10极场分布进行校正。

When the Dilemma and Trilemma constants are all small value , the fifth order coma and astigmatism can be corrected by adjusting the distribution of 10 pole field .

由此得到了电子光学广义的Fraunhofer条件（即消除各向同性和各向异性彗差的条件），证明了在此条件下，象散和场曲取极值或稳定值。

Therefore the general electron optical Fraunhofer conditions for correcting isotropic and anisotropic coma are obtained . It is shown that under this condition , astigmatism and field curvature have extreme or stationary values .

散光影响垂直彗差和总高阶像差；

Astigmatism affected total higher order aberrations and vertical primary coma .

基于双线空间像线宽不对称度的彗差测量技术

On-Site Coma Measurement Technique Base on Linewidth Asymmetry of the Aerial Image

结论散瞳后瞳孔中心普遍发生偏移，根据其偏移量在术中对切削区中心作相应调整可提高彗差的矫正效果。

Conclusions Pupil center shift after dilation is common .

瞳孔增大后，球差、彗差比率增加。

The frequency of spherical aberration and coma increased as the pupil got larger .

三级像差框架下，彗差具有单节点、像散双节点、畸变具有三节点特性。

The field characteristics of single-node coma , dual-node astigmatism , triple-node distortion are analyzed .

鱼眼透镜和超广角镜头具有很严重的光阑球差、光阑彗差。

Fish-eye lenses or extreme wide-angle objectives have notable stop spherical aberration and stop coma .

非轴对称光学系统的彗差计算

Calculation of coma of unsymmetric optical system

但常规设计并未考虑非中心波长处彗差和分辨率的变化情况。

However , the design process does not take the comas and resolutions at non-central waves into consideration .

干眼高阶像差中主要构成依次为三叶草、彗差、像散、球差；

The major component of higher order aberration in dry eyes was trefoil , coma , hi-astigmatic aberration in order of importance .

对光学成像产生影响的主要成分是散光像差、彗差和三叶草像差。

Meanwhile , astigmatism aberration , coma aberration and trefoil aberration are three main effects that influence the quality of the optics .

最终证明彗差会造成谱形失称，明显降低耦合效率；而球差则会明显地增加串扰。

It is shown that the symmetry of the spectral response and the coupling efficiency will be deteriorated when the coma appears during the diffraction and imaging .

结果：总高阶相差、水平彗差、垂直彗差和球差均随瞳孔直径的增大而增大；

Results : Total higher order aberrations , spherical aberration , horizontal primary coma , and vertical primary coma , were increased significantly with increasing pupil size .

术后3个月内，彗差、球差均较术前增加，而三叶草像差、四叶草像差和高阶散光则无明显改变。

Some higher order aberrations such as total coma and total spherical aberration increased after LASIK while total trefoil , total 4 foil and high astigmatism did not change .

在高数值孔径、低工艺因子的光刻技术中，投影物镜彗差对光刻质量的影响变得越来越突出，因而需要一种快速、高精度的彗差原位测量技术。

In high numerical aperture and low technic factor lithography process , degradation of the image quality because of the coma aberration in the projection lens has become a serious problem .

由于光栅面形及其线密度的变化，不仅对光栅成像的聚焦特性有所改善，对彗差等高阶次像差的影响也是不可忽略的。

As a result of shape change and groove density variation , it not only improves the focusing condition , but also affectes higher order aberrations such as coma aberration of the imaging system .

详细的阐述了在偏心和倾斜影响下光学系统的三阶波像差特性，着重讨论了彗差、像散和场曲在整个视场中分布规律。

The behavior of third-order aberration in decentered and tilted optical systems are described in detail , focusing on distribution of the coma , astigmatism and field curvature in the entire field of view . 3 .