Long Range Oblique Photography Camera Optical System for Simultaneous Shooting of Triple Band Wavelength Image

摘要

The present invention relates to a stepping photographing type long range oblique photography (LOROP) camera optical system to simultaneously photograph a tri-bandwidth image of electric optical (EO), short wave infrared (SWIR), and middle wave infrared (MWIR). A reflective telescope is used for an optical system in accordance with necessity of a large objective lens to acquire a long-range image and of a long focal length for high magnification, and a two-dimensional (2D) array detector is used for stepping photographing. To efficiently utilize a space and classify EO, SWIR, and MWIR images, a Nasmyth focal optical system is applied and a planar beam splitter made of a silicone material is inserted between a main and sub mirrors. Thereafter, the EO and SWIR images are divided with a cubic beam splitter prism, and are corrected with an individual rear-end optical system. The tri-bandwidth optical system includes a scan mechanism to correct roll-driving.