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渐晕
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  vignetting
     According to the special needsin use, the main design feature of this proiection objective is that:with the premise ensuring the requiremnt of given image quality andlarger relative aperture (D/f′= 1/2.5), the uniformity of illuminance inthe whole field of view is better achieved, i.e. the linear vignettingcoefficient K_D at point near periphery of field comes to 0.85 (correspond-ing area vignetting coefficient Ks is 0.8).
     根据使用的特殊要求,本投影物镜设计的主要特点是:在保证给定的象质要求和较大的相对孔径(D/f’=1/2.5)的前提下,较好地实现了全视场照度的均匀一致性,边缘视场的线渐晕系数K_D达到0.85(对应的面渐晕系数Ks达到0.8)。
短句来源
     The Match Form Between Exit Pupil and Cold Shield and the Vignetting Calculation at a IR Optical System
     红外光学系统出瞳与冷屏匹配方式及渐晕分析计算
短句来源
     The basical principle of confocal theer scanning fluorescence microscope is described briefly in the paper, and the method for determination of scanning system scheme and for optimum design robed. By use of this method, the scanning vignetting can be reduced to 1% of the original one.
     本文简述共焦激光扫描荧光显微镜的基本原理,提出扫描系统的方案确定和优化设计的方法,使用该方法可使扫描渐晕减少为原来的1%。
短句来源
     Concerning the Vignetting Coefficients in the Optimization Design of Zoom Lenses
     关于变焦系统优化过程中渐晕系数问题的讨论
短句来源
     The aberration curves, transform function and vignetting of the wide aperture lens are presented.
     对该镜头的结构特点进行分析讲讨论 ,并给出了各种像差曲线 ,传函曲线和渐晕图。
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  “渐晕”译为未确定词的双语例句
     The value | ( HP-H*p)/H*p|i abtained by the ray tracing may reach 0.1. After making a further correction, the accuracy in the calculation of the vignetted pupil could be around 0.01-0.001.A comparison with the King's method has been carried out.
     对其作光线追迹求得的|(H_(p-)H_p*)/H_p*|i值可达0.1。 作一次修正后,渐晕瞳的计算精度可达0.01~0.001。
短句来源
     Generally, the King's method is used in the calculation of the vignetted pupil.
     渐晕瞳的计算通常采用King的方法。
短句来源
     Secondly, every cause resulting in reconstructed image artifacts during obtaining projection and reconstructing image is studied, such as the length selection of the filter, rotation center deviation, vignette in the imaging system, CCD dark current, pulse noise and scatter in this paper.
     其次,本文研究了投影获取及重建过程中,产生CT图像伪像的各个环节,如滤波函数的长度的选取、旋转中心偏移、成像系统渐晕、CCD暗电流、脉冲噪声、散射等,提出了相应的消除方法。
短句来源
     Conclusion\ The exact quantification of corrosive will be influenced by the intrinsic defect in the screen and the position of the center of halation.
     结论 屏上的固有缺陷、渐晕中心与转换屏的相对位置等都会影响锈蚀的准确量化 .
短句来源
     Theory and experiment indicate that the quality of image has been improved after processing of vigenetting offset to the marginal part of infrared image.
     理论和实验结果表明 ,对红外图像边缘区的渐晕补偿改善了图像的质量。
短句来源
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  相似匹配句对
     Research on vignetting in thermal imaging system
     红外系统中渐晕的研究
短句来源
     A Fast Method for Calculating Vignetted Pupil of Optical Systems
     光学系统渐晕光瞳的快速算法
短句来源
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  vignetting
It is noted that quantum-interference transconductance oscillations can occur only if the amplitude and phase of each of the three electron waves on the gate aperture, as well as electron-wave vignetting, are dependent on the gate potential.
      
A discussion is given of the possible techniques for cascade correction in beam-foil lifetime measurements, and of the inclusion of a window function to represent the vignetting effect close to the foil.
      
Details of dye choice, corrections for attenuation due to dye, particles and water, photobleaching, vignetting, CCD calibration, and illumination power and geometry corrections are presented.
      
The results were encouraging, given the degraded quality of the photograph and the fact that features were not centered, as well as the lack of information on lens vignetting characteristics to make corrections.
      
The 13 scanned films have been aligned, coadded, corrected for vignetting effects and cleaned of stellar features.
      
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For advancing the calculating accuracy of the optical transfer fu-nction, the boundary of the vignetting pupilis divided into an upper curve and alower one. They are fitted by generalized polynomials in the sense of least square.The numerical integration of the OTF adopts gaussian integration with the highestalgebraic accuracy, and the mathematical treatments of integral region are discussedin different cases. Finally a computing example is given.

为了提高光学传递函数的计算精度,把渐晕光瞳边界线分成上、下两条曲线,应用广义多项式在最小二乘意义下进行曲线拟合;光学传递函数的数值积分采用最高代数精度的高斯积分,并讨论在不同情况下积分区域的数学处理。最后给出了计算实例。

This paper discusses the design feature and rational scheme of DoubleGauss photoetch projection objective which is used to photograph large sizeand high accuracy optical coding mask. According to the special needsin use, the main design feature of this proiection objective is that:with the premise ensuring the requiremnt of given image quality andlarger relative aperture (D/f′= 1/2.5), the uniformity of illuminance inthe whole field of view is better achieved, i.e. the linear vignettingcoefficient K_D at point...

This paper discusses the design feature and rational scheme of DoubleGauss photoetch projection objective which is used to photograph large sizeand high accuracy optical coding mask. According to the special needsin use, the main design feature of this proiection objective is that:with the premise ensuring the requiremnt of given image quality andlarger relative aperture (D/f′= 1/2.5), the uniformity of illuminance inthe whole field of view is better achieved, i.e. the linear vignettingcoefficient K_D at point near periphery of field comes to 0.85 (correspond-ing area vignetting coefficient Ks is 0.8). In designing the economyand the technique were taken into consideration. Since putting intooperation, good economical benefit of the projection objective has already been gained.

本文讨论了应用于摄制大型、高精度光学码盘的双高斯型光刻投影物镜的设计特点与合理方案。根据使用的特殊要求,本投影物镜设计的主要特点是:在保证给定的象质要求和较大的相对孔径(D/f’=1/2.5)的前提下,较好地实现了全视场照度的均匀一致性,边缘视场的线渐晕系数K_D达到0.85(对应的面渐晕系数Ks达到0.8)。设计中重视了经济性与工艺性,立足于工厂的现有条件。所设计的物镜自投入生产以来,已取得了良好的经济效益

Generally, the King's method is used in the calculation of the vignetted pupil.A fast algorithm, in which (HP - H*p)/H*p i, min<ε is employed as a discriminant to check the ray whether or not passing through the edge of the clear apertue at ith surface, is proposed. In this way, the initial coordinate of the ray passing through the marginal point of the vignetted pupil at any azi-muth could be evaluated readily. The value | ( HP-H*p)/H*p|i abtained by the ray tracing may reach 0.1. After making a further correction,...

Generally, the King's method is used in the calculation of the vignetted pupil.A fast algorithm, in which (HP - H*p)/H*p i, min<ε is employed as a discriminant to check the ray whether or not passing through the edge of the clear apertue at ith surface, is proposed. In this way, the initial coordinate of the ray passing through the marginal point of the vignetted pupil at any azi-muth could be evaluated readily. The value | ( HP-H*p)/H*p|i abtained by the ray tracing may reach 0.1. After making a further correction, the accuracy in the calculation of the vignetted pupil could be around 0.01-0.001.A comparison with the King's method has been carried out. The results show that the method presented in this paper is about 2-6 times faster than King's.

渐晕瞳的计算通常采用King的方法。本文提出一种快速算法,用|(H_(p-)H_p~*)/H_p*|i,min<ε作为判别式,以检验光线是否通过某一表面通光孔径的边缘。此方法能方便地求出过渐晕光瞳任意方位边缘点光线的初始座标。对其作光线追迹求得的|(H_(p-)H_p*)/H_p*|i值可达0.1。作一次修正后,渐晕瞳的计算精度可达0.01~0.001。对比计算的结果表明,本文所提方法要比King的算法快2—6倍。

 
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