In this paper, simulation model of infrared optical systems with Cassegrain structure has been built up, and the stray
radiation analysis has been performed. The contributions of each component to stray radiation of infrared system and the
corresponding optical path of stray radiation have been studied in detail. On this basis, the flux distributions of the stray
radiation of the major contributors on the detector have been simulated, and the uniformity of the flux distributions has
also been discussed. In order to suppress the stray radiation of the system, the corresponding methods have been adopted
according to different paths of the stray radiation. Finally, the flux of stray radiation and the uniformity of the flux
distributions on the detector before and after taking the suppression measures have been compared and analyzed. The
results indicate that the methods for suppressing the stray radiation according to the characteristics of stray radiation
source can effectively improve the stray radiation performance of the system, resulting in the improvement of the detection performance of the system.
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