Design of dual band common aperture continuous zoom optical system

Abstract

To rapidly accommodate social demands and the requirements of imaging system under increasingly complex application environment, and to optimize the complex and bulky existing multi-spectrum continuous zoom optical systems, a short-wave(0.9μm to 1.7μm) and long-wave(7.7μm to 9.3μm) infrared radiation common aperture continuous zoom optical system was designed, the focal lengths of short-wave and long-wave infrared radiation were 8mm to 32mm and 30mm to 120mm respectively, the zoom ratio was 4.The system was analysed according to the theory of positive group compensated zoom, powers of the zoom group and the compensation group were well matched, only ZNSE and ZNS materials were applied in the common group. The results of the experiment show that the optical system is compact in structure, and has good image quality in different spectrums, can work around the clock under complex environment.