光子学报, 2017, 46 (11): 1122004, 网络出版: 2017-12-08
折/衍混合大视场消热差红外双波段光学系统设计
Designfor Cooled Dual-band Infrared Refractive-Diffractive Hybrid Optical System of Athermalization and Wide FOV
光学设计 双波段 消热差 折/衍混合 大视场 Optical design Dual-band Athermalization Refractive/diffractive hybrid Wide field of view
摘要
根据双波段消热差理论设计了大视场消热差红外双波段光学系统.系统为4片式反远结构, 包括一个衍射面和一个非球面, 设计波长为3.5~4.8 μm/8~12 μm, 焦距为8 mm, 全视场80.2°, F/#为2, 系统出瞳与冷光阑严格匹配, 满足100%冷光阑效率.根据消热差条件和波段间消色差条件, 得出4片分离薄透镜光焦度分配的解, 进一步建立了三维投影消热差图, 据此合理选择光学材料.根据环境温度要求, 利用光学被动式消热差的方法实现了系统在-40~60℃的温度变化范围内的消热差设计.结果表明, 系统在环境温度变化范围内成像质量良好, 实现了光学系统无热化.
Abstract
On the basis of the dual-band athermal theory, a cooled dual-band infrared refractive-diffractive hybrid optical system of athermalized and wide field of view was designed. The system consists of 4 lenses and introduces only 1 diffractive surface and 1 aspherical surface, the full field of view is 80.2°, the focal length is 8 mm, F number is 2, the operating wavelength range is 3.5~4.8μm and 8~12μm, and the cold stop efficiency is 100%. The solutions of 4 separate thin lenses were obtained by analyzing dual-band achromatic and athermalized theory. Further, establishing the material model of athermalized dual-band optic system and choosing the optical materials properly. According to requirements, the dual-band athermal optical system with temperature of -40℃ to 60℃ was designed with the use of optical passive. The reasults prove that the optical system obtains a good image quality during -40℃ to 60℃, and realizes athermalization.
陶郅, 王敏, 肖维军, 郭王凯. 折/衍混合大视场消热差红外双波段光学系统设计[J]. 光子学报, 2017, 46(11): 1122004. TAO Zhi, WANG Min, XIAO Wei-jun, GUO Wang-kai. Designfor Cooled Dual-band Infrared Refractive-Diffractive Hybrid Optical System of Athermalization and Wide FOV[J]. ACTA PHOTONICA SINICA, 2017, 46(11): 1122004.