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由于受光学系统结构和使用条件的限制,红外投影仿真系统要求目标/干扰发生器共用一个光学系统,入瞳距大于1000mm,光学件质量小于等于3kg,体积限制在Φ250mm×480mm范围内。在原理设计上,采用无焦系统与后聚焦镜组的复合方式,在平行光路中加入平面耦合镜,实现了在大入瞳距条件下,目标/干扰共用同一光学系统的设计。此外,系统中采用了两个非球面,保证了系统在较少的光学零件情况下具有优良的像质和要求的透过率。同时,只需沿轴移动最后一组透镜,就可以实现调焦。最终设计结果为:全系统共有11个光学零件,质量约2.5kg,入瞳距1050mm,最大口径为220mm,全视场MTF大于等于0.7,90%能量集中在20μm弥散圆内,满足了系统要求的各项技术指标。
Due to the limitations of the optical system structure and the conditions of use, the infrared projection simulation system requires that the target / disturbance generator share an optical system with an entrance pupil distance of more than 1000 mm, an optical quality of 3 kg or less, and a volume limit of 250 mm × 480 mm. In the principle design, the non-coke system and the rear focusing lens group are used in the composite mode, and the plane coupling mirror is added in the parallel light path to realize the design that the target / interference share the same optical system under the conditions of large and large interpupillary distance. In addition, the system uses two aspherical surfaces, ensuring that the system has excellent image quality and required transmissivity with fewer optical components. At the same time, focusing can be achieved by simply moving the last lens along the axis. The final design results are as follows: There are 11 optical components in the whole system, with a mass of about 2.5kg, an interpupillary distance of 1050mm, a maximum aperture of 220mm, a total field of view MTF of 0.7 or greater, and a power of 90% concentrated within a confining circle of 20μm to meet the system requirements The technical indicators.