The simulation of imaging system is to verify the design of the system in the early stage of design. Optical design should consider the influence of system reference on system performance at the beginning of system design. The process of image energy collecting of the line array detector is complex. Based on the wave theory and spectrum theory of light, the propagation of object space light through optical system is studied, and the image is formed on the image plane collected by detector, and the process is simulated. At the same time, based on the principle of the 480×6-line array detector, the sampling process of the detector in focal plane is simulated. The simulation results show that the simulation results of the model match the limit resolution of the optical system calculated by the theory well.
Different from visible light, infrared optical systems need to consider various effects in order to change the F-number of the system, such as the effect of stray light in the system before and after variable F number, and the effect of cold reflection on the system, which are all effects to be considered. This paper analyzes the technology of infrared variable F number, summarizes the research progress, and the key technology of thermal aperture variable F-number.
A secondary imaging convergence system is designed for a cooled infrared optical system with three Germanium lenses. An optimal design method for low stray radiation is proposed. Compared with the traditional method, stray light analysis shows that the new design method can suppress stray radiation by 23.87% more than the traditional method.
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