| 成像系统均方根半径及调制传递函数的计算 |
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| 引用本文： | 张良忠,金伟其,周立伟. 成像系统均方根半径及调制传递函数的计算[J]. 电子学报, 2000, 28(8): 5-8 |
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| 作者姓名： | 张良忠 金伟其 周立伟 |
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| 作者单位： | 1. 北方交通大学光波技术研究所,北京 100044;2. 北京理工大学光电工程系,北京 100081 |
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| 摘 要： | 本文给出了逸出电子在最佳像面上落点的均方根半径值及直观图形表示;以实际管型为例,βeta分布取β1,8至β2,1,检验了均方根半径的变化状况,证明了理论分析的正确性;从数据上检验了均方根半径不仅可以表征系统鉴别率特性的好坏,而且和调制传递函数的优劣在像面上是一一对应的;证明了用指数形式表示系统的调制传递函数具有计算速度快、形式简洁、使用方便,并且在低频空间具有足够的精度.
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| 关 键 词： | 均方根半径 调制传递函数 成像系统 βeta分布 数值计算 |
| 收稿时间： | 1999-03-26 |
Computation on Root Mean Square Radius and Modulation Transfer Function in Imaging Systems |
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| ZHANG Liang-zhong,JIN Wei-qi,ZHOU Li-wei. Computation on Root Mean Square Radius and Modulation Transfer Function in Imaging Systems[J]. Acta Electronica Sinica, 2000, 28(8): 5-8 |
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| Authors: | ZHANG Liang-zhong JIN Wei-qi ZHOU Li-wei |
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| Affiliation: | 1. Institute of Lightwave Technology,Northern Jiaotong university,Beijing 100044,China;2. Dept.of Photo-electronics Engineering,Beijing Institute of Technology,Beijing 100081,China |
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| Abstract: | In the paper,the value of RMS radius and the visual picture of escape electron dropped spots in optimum image plane has been given.The present paper has offered data to prove that when the βeta distribution changes from β1,8 to β21,the RMS radius value increases gradually,corresponding with theoretic analysis.It has offered data to check that the RMS radius not only can characterize the system resolution properties,but also does it correspond with the electron optical modulation transfer function (MTF) in image plane,and proved that expressing the system MTF by exponential function will have the properties of fast computation speed,succinct expression,convenient usage,and have enough accuracy in low frequency space. |
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| Keywords: | root mean square radius modulation transfer function imaging systems βeta distribution')" href=" #" >βeta distribution numerical computation |
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