Ms. Ke Li Profile

Ke Li

at Beijing Institute of Space Mechanics & Electricity

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Proceedings Article | 11 June 2021 Open Access

Optical design of six-mirror Anastigmat(6MA) off-axis freeform system

Baohua Wang, Wenchun Jiao, Ke Li, Yuanyuan Wang

Proceedings Volume 11852, 1185208 (2021) https://doi.org/10.1117/12.2599148

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There is an urgent need for the imaging spectrometer with high spatial resolution and wide swathing range in the field of environment monitoring, agriculture evaluation and emergency disaster reduction. At the same time, higher request for the performance of spectrometers, such as signal-to-noise, is put forward to realize high-precision data inversion and quantitative detection. A telescope optical system with long focal length, large relative aperture and wide field-of-view is designed using for imaging spectrometer. The focal length is 1200 mm, the relative aperture is 1/3 and the field-of-view is 10°×1°. A new re-imaging off-axis six-mirror anastigmat (6MA) configuration is adopted. It is beneficial to control the stray light and achieve the telecentric design in the image space. A real entrance pupil is located in front of the system to minimize the aperture of scanning mirror. The whole system is divided into two modules and each module can image perfectly at the axial field of view. Therefore, each module can be aligned and tested individually to reduce the alignment difficulty of the whole system. The off-axis freeform surface is used to control the distortion lower than 0.5% and advance the imaging quality. Finally, the manufacture and alignment tolerance are simulated and analyzed. The design and analysis results show that the six-mirror anastigmat (6MA) off-axis freeform system can satisfy the demand of high-performance hyperspectral imaging for earth monitoring. Good imaging quality and loose tolerances indicate that this optical system is of strong engineering application value.

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Proceedings Article | 31 January 2020 Paper

Stray light suppression of ocean camera

Ke Li, Xiaolin Liu, Tuotuo Li, Bei Chu

Proceedings Volume 11427, 114271K (2020) https://doi.org/10.1117/12.2551604

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The optical-mechanical model of the off-axis optical system with oscillating mirror is established. The stray light path is analyzed on the basis of the simulation results. According to various types of stray light paths, the main path of stray light are determined and the influence of important surfaces and illumination surfaces on stray light of the camera are clarified. Effective restraint measures are proposed without blocking the imaging light. After re-simulation, the veiling glare indexes of the two imaging channels are greatly reduced. PST (Point Source Transmittance) is used as an index to test the validity of stray light suppression measures. When the off-axis angle is 30 degrees, the PST of the camera reaches 10-8, which meets the design requirements.

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