| 光强局部选通成像器中光锥耦合技术研究 |
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| 引用本文： | 唐远河,杨旭三,郜海阳,刘术林,王水威. 光强局部选通成像器中光锥耦合技术研究[J]. 光学技术, 2012, 38(1): 3-8 |
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| 作者姓名： | 唐远河 杨旭三 郜海阳 刘术林 王水威 |
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| 作者单位： | 西安理工大学理学院;北方夜视科技集团微光器件中心西安分部 |
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| 基金项目： | 国家自然科学基金资助项目(10874138);西安理工大学联合基金资助项目(108-210920) |
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| 摘 要： | 为了实现景物在强光照射下能够分辨图像的细节,在液晶的光强局部选通成像器中,使用光锥将TFT-LCD液晶耦合到CCD相机上以实现图像的实时传递。通过理论分析和计算,采用光锥耦合获得的耦合效率为14.24%,而透镜耦合则只有1.83%,由前者耦合后构成的局部选通系统,其调制传递函数曲线中奈奎斯特频率为0.518,极限分辨率为34 lp/mm,由此制作的器件,在对高照度下图像的细节分辨,明显高于透镜耦合的器件。分析了造成该系统MTF下降的因素,并提出了进一步改善MTF的技术措施。
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| 关 键 词： | 成像光学 光强局部选通成像 光锥耦合 耦合效率 调制传递函数 |
| 收稿时间： | 2011-08-01 |
Study of the optic taper coupling technique in partially light-controlled imaging detector |
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| TANG Yuanhe,YANG Xusan,GAO Haiyang,LIU Shulin,WANG Shuiwei. Study of the optic taper coupling technique in partially light-controlled imaging detector[J]. Optical Technique, 2012, 38(1): 3-8 |
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| Authors: | TANG Yuanhe YANG Xusan GAO Haiyang LIU Shulin WANG Shuiwei |
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| Affiliation: | 1(1.School of Science,Xi’an University of Technology,Xi’an 710048,China)(2.Xi’an Branch,North Night Vision Technology Co.Ltd.,Xi’ani 710065,China) |
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| Abstract: | In order to distinguish details of the image under strong light,the optic taper is employed in the partially light-controlled imaging detector based liquid crystal,tender that the image is transferred from TFT-LCD(Thin Film Transistor-Liquid Crystal Display)to CCD(Charge-Coupled Device)in real time.Through theoretical analysis and calculation,the coupling efficiency with optical tapper to CCD is 14.24%,while,and the coupling efficiency with lens is 1.83%.MTF(modulation transfer function) of the system coupling with optical taper is 0.518 at Nyquist frequency,and the limit resolution is 34 lp/mm.The device produced with this method can distinguish details of the image under high illumination.It is better than the lens-coupled device significantly.The reasons that MTF drops in practical engineering is analyzed,and some methods solving the matter is put forward. |
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| Keywords: | imaging optics partial gating light intensity optic taper coupling coupling efficiency modulation transfer function |
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