Abstract
In this paper, the athermal performance of a long-range oblique photography (LOROP) sensor with an all-SiC telescope is described. The dual-band LOROP sensor includes a visible and nearinfrared (VNIR) band and a mid-wave infrared (MWIR) band, which use a common reflective mirror system. The Cassegrain telescope is composed entirely of SiC to achieve an athermal characteristic. During the flight, a thermal effect on the optical system is observed to be negligible, and the athermal performance was found to be extremely stable. Particularly, no performance degradations due to the temperature gradient were observed.
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