Abstract
针对致冷型中波红外640×512凝视型焦平面探测器,设计了一个30<sup>×</sup>连续变焦光学系统。介绍了由无后固定组的变焦物镜组和中继透镜组组成的连续变焦系统的设计思路,不仅给出了系统在短焦、中焦、长焦3个位置的像质情况,还分析了反映全焦距范围内像质的离焦量和畸变。实验结果表明:该系统工作波段3.7 μm~4.8 μm,可以实现18 mm~540 mm连续变焦,全焦距范围内的离焦量都在焦深以内,长焦段最大畸变接近于0,短焦段最大畸变小于3%。该系统具有大变倍比、结构紧凑、变焦轨迹平滑、变焦行程短等优点,可用于红外光电探测和跟踪系统。
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