| 双波段CCTV鱼眼镜头光学系统设计 |
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| 引用本文： | 张欣婷,亢磊,吴倩倩.双波段CCTV鱼眼镜头光学系统设计[J].应用光学,2021,42(6):1006-1010. |
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| 作者姓名： | 张欣婷 亢磊 吴倩倩 |
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| 作者单位： | 1.长春电子科技学院，吉林 长春 130012 |
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| 基金项目： | 吉林省科技厅重点科技研发项目（20180201044YY） |
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| 摘 要： | 根据CCTV（closed circuit television）镜头的使用需求，以“非相似”成像原理为基础，设计了一款双波段CCTV鱼眼镜头。系统工作波段480 nm～850 nm，可见光和近红外光双波段成像，可实现昼夜监控。镜头F数1.8、视场角1800、焦距1 mm、光学总长7.76 mm，具有大相对孔径、大视场角、小型化等特征。采用7组9片式反远距结构，无特殊玻璃、无非球面，大大降低了系统复杂化程度和加工制造成本。利用光学设计软件Zemax对其进行光学系统设计，选取1/3英寸CCD作为探测器，在奈奎斯特频率120 lp/mm时，其各个视场的子午调制传递函数曲线和弧矢调制传递函数曲线值均达到0.5以上，接近衍射极限，成像质量很好。全视场场曲均小于1 mm，相对畸变小于25%，相对照度在95%左右，满足CCTV镜头的使用要求，可广泛用于监控侦察等领域。
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| 关 键 词： | 光学设计 CCTV镜头 双波段 大视场 大相对孔径 |
| 收稿时间： | 2021-03-29 |
Optical system design of dual band CCTV fish-eye lens |
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| Affiliation: | 1.Changchun Institute of Electronic Science and Technology, Changchun 130012, China2.CRRC Changchun Railway Vehicles Co.,Ltd., Changchun 130062, China |
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| Abstract: | According to the use requirements of closed circuit television (CCTV) lens, a dual band CCTV fish-eye lens based on the principle of non-similar imaging was designed. This system works in the wavelength range of 480 nm~850 nm, with the dual band imaging of visible light and near-infrared light, which could realize day and night monitoring. The F-number is 1.8, the field angle is 180o, the focal length is 1 mm, and the total optical length is 7.76 mm. The lens has the characteristics of large relative aperture, large field angle and miniaturization. The system adopts 7 groups of 9-piece anti long distance structure, without special glass and aspheric surface, which greatly reduced the complexity of the system and the manufacturing cost. The optical design software Zemax was used to design its optical system, selecting the 1/3 inch CCD as the detector. When the Nyquist frequency is 120 lp/mm, the values of meridional modulation transfer function curves and the sagittal modulation transfer function curves of each field of view are more than 0.5, close to the diffraction limit, and the imaging quality is good. The field curvature of the whole field is less than 1 mm, the relative distortion is less than 25%, and the relative illumination is about 95%, which meet the use requirements of CCTV lens, and can be widely used in monitoring and reconnaissance fields. |
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