【摘要】 切换变倍光学系统能实现系统两档/多档变倍,根据切换变倍光学系统特性,完成切换组元焦距与系统组元间隔、焦距、F数和系统变倍比之间关系理论研究,在窄视场子系统中旋转切入"负-正"搭配透镜组实现宽视场(短焦)子系统,同时要求该窄视场时,视场变换透镜组元不挡光。通过设计中波切换变倍光学系统实例,验证了所推导出的公式的可靠性。切换变倍系统能实现系统两档/三档变倍,且视场间切换时间快,窄视场子系统系统片数少、系统作用距离远,符合系统搜索跟踪一体化需求。更多还原

【Abstract】 A rotate-in-group zoom optical system can realize dual/multiple field-of-view(FOV) switch,and according to its characteristics the relation of rotate-in-group lenses focus and system’s lenses spacing,focus,F number and magnification factor is retrieved.Rapid switch is achieved for a rotate-in-group zoom optical system when a narrow FOV subsystem changes to a wide one after a rotate-in motion of two negative-positive separated lens groups.Meanwhile,in the wide field mode,the FOV switch lens group is located outside the active narrow-field ray-bundle without intersection.The derived formula is proved by the design of a focal plane array-based midwave infrared rotate-in-group zoom optical system.The designed system has rapid dual/triplex FOV switch,limited lens number for narrow FOV subsystem,and large operation range,and meets the requirement of infrared search and track.更多还原