光学技术, 2012, 38 (1): 3, 网络出版: 2012-04-20
光强局部选通成像器中光锥耦合技术研究
Study of the optic taper coupling technique in partially light-controlled imaging detector
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 imaging optics partial gating light intensity optic taper coupling coupling efficiency modulation transfer function
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。
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.
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. 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.
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