Infrared and Laser Engineering, Volume. 49, Issue 3, 0314002(2020)
Realized large field of view infrared imaging system of single lens with external field splicing
Based on the principle of external field splicing, a principle prototype of large-field mid-wave infrared was developed. A cooled mid-wave infrared optical system was designed. The secondary imaging structure of the optical exit aperture coincides with the cold screen was adopted to make sure 100% cold shielding efficiency of the system. The working wave band was 3.7-4.8 μm, the focus was 40 mm, the relative aperture was 1:2, the full field of view was 21.74°×17.46°(27.88°), the total length of the system was 145 mm. The principle of external field splicing with time-sharing exposure imaging of holes/mirrors was adopted, 2×1 field of view expansion was realized. The design result show that MTF>0.68 of the off-axis field of view at spatial frequency of 21 lp/mm, which closes to the diffraction limited. The system has compact constructure and has high imaging quality. The feasibility and rationality of the splicing principle were verified using prototype .
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Qiusha Shan, Xiuqin Su, Jing Duan, Liang Zhou, Kai Liu, Peipei Yan, Kai Jiang. Realized large field of view infrared imaging system of single lens with external field splicing[J]. Infrared and Laser Engineering, 2020, 49(3): 0314002
Received: Nov. 5, 2019
Accepted: --
Published Online: Apr. 22, 2020
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