To improve environmental adaptability, an optical system with passive optical athermalization was designed. This system adopts a transmission structure with a spectral range of 0.4-1.0μm, a focal length of 166mm, a F number of 3.7 and a field view of 5°. An optical system with passive optical athermalization should satisfy three constraints. The first is the power distribution of each lens. The second is the achromatic equation. The last one is the athermal equation. A reasonable optical material combination is obtained by solving the three conditional equations. Then the initial optical system is simulated and optimized by Zemax. In the end, this system gains good imaging quality in the working temperature range of 10-30°C.
In order to improve the imaging quality of the space target detection camera while minimizing the size of the camera structure and facilitating its attitude control, a retractable lens hood is proposed. The basic structure and design method of the telescopic lens hood are introduced. The use of a retractable lens hood structure to replace the long lens hood in the previous design, optimizes the structure of the system, and greatly reduces the size of the system. Analyze the feasibility of the camera's retractable lens hood and the suppression effect of stray light. Use LightTools software to build a model to analyze the ray tracing of the camera's hood. The results show that the point source transmittance (PST) of the retractable hood is gradually reduced under different off-axis angles. When the off-axis angle is greater than 30°, the PST of the optical system reaches the order of 10-6 , which effectively suppresses the stray light of the system.
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