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4 April 2023 Design and tolerance analysis of multispectral infrared off-axis three mirror optical system
Chenfeng Wang, Weiguo Lu
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Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126175Y (2023) https://doi.org/10.1117/12.2666631
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China
Abstract
In the field of infrared detection, as the application scenarios become more and more complex, the infrared optical system of a single band is limited by the impact of the detection environment, resulting in too little information received, which can no longer meet the detection requirements. Multispectral detection becomes the future research hotspots of such optical systems. Taken advantage of the basic principle of the Gaussian optics and the primary aberration theory, an off-axis three mirror optical system is devised to avoid the central occlusion and improve the energy utilization. The simulation results show that the full field modulation transfer function at the spatial frequency of 20lp/mm in the 4.2~4.45μm band is greater than 0.6, and the MTF of 20lp/mm in the 5.8~7.3μm band is greater than 0.5. In addition, reasonable allocation of system tolerance will greatly affect the imaging capability of the system. Using tolerance sensitivity analysis and inversion sensitivity analysis, calculate the impact of each tolerance on the imaging performance of the system, and reasonably allocate the tolerance. After simulation analysis, the MTF of the system is greater than 0.4 according to the given common error processing and assembly.
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Chenfeng Wang and Weiguo Lu "Design and tolerance analysis of multispectral infrared off-axis three mirror optical system", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126175Y (4 April 2023); https://doi.org/10.1117/12.2666631
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KEYWORDS
Mirrors
Tolerancing
Off axis mirrors
Design and modelling
Imaging systems
Infrared imaging
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