两挡变焦光学系统的齐焦设计

受光学材料折射率、光学加工以及光学装校等误差因素的影响，宽视场短焦子系统和窄视场长焦子系统组成的两挡变焦光学系统的实际像面均偏离理想像面即发生像面漂移，但漂移量不同，导致两子系统产生不齐焦现象。为了解决此问题，以某型载荷中波红外两挡变焦光学系统设计为例，分析齐焦设计时定长焦调短焦和定短焦调长焦两种设计方案的优缺点。比较了定长焦调短焦3种方法，即调变倍组与补偿组、调变倍组和调补偿组的补偿量与长焦焦距变化情况，定短焦调长焦3种方法，即调变倍组与补偿组、调变倍组和调补偿组的补偿量与短焦焦距变化情况，指出定长焦调短焦、单调补偿组的齐焦设计方案为最优方案。

Confocal design for switch-zoom optical system

Switch-zoom optical system is composed of the subsystem with wide field of view and the subsystem with narrow field of view. Due to the errors from many aspects such as the refractive index of optical material, the optical manufacturing and assembling, the actual image surfaces of both subsystem deviate from their ideal image surfaces, and the drifts are different, that is, the two subsystems are not confocal. To solve the problem, a variety of confocal design schemes, the selection principle and an optimal scheme which fixed long focus and adjusted short focus, adjusted the compensating set for a mid-wave infrared (MWIR) switch-zoom optical system were given.