Mr. Hongwei Zhang Profile

Hongwei Zhang

at Xi'an Institute of Optics and Precision Mechanics

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Publications (2)

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Proceedings Article | 29 December 2023 Paper

Precise assembly and adjustment technology of fully free-form surface multi-reflection off-axis optical system

Xing Qin, Xihong Fu, Fan Yang, Zhong Shen, Bindong Ji, Hongwei Zhang, Rui Qu

Proceedings Volume 12976, 1297620 (2023) https://doi.org/10.1117/12.3009602

KEYWORDS: Mirrors, Optical surfaces, Mirror surfaces, Reflectors, Off axis mirrors, Imaging systems, Tolerancing, Reflection, Design and modelling, Computing systems

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With the rapid development of large field of view, large aperture and unobstructed space optical imaging system, the optical imaging system structure has developed from aspherical coaxial and off-axis free surface off-axis. Free surface is applied to multi reflective Off-axis optical system to balance the sharply increased off-axis aberration. Because the free-form surface does not have symmetry, the full free-form surface multi reflective Off-axis optical system has lost the rotational symmetry of the traditional optical system in structure, resulting in more degrees of freedom in the installation and adjustment of the full free-form surface multi reflective Off-axis optical system, the relationship between optical axes of various optical elements is complex, the system integration is more difficult, and the installation and adjustment process is difficult to monitor. Based on this, the paper proposes a precise alignment process method of the full free-form surface multi reflection Off-axis optical system. The space global coordinate system is established through the space coordinate measurement equipment, and the precise attitude of each reflector is monitored by combining the self-aligning Theodolite and cube mirror, and the reference transfer space position is measured by using the self-aligning microscope and the measurement target ball. he engineering project verification shows that this assembly and adjustment process method realizes the unification of the design, processing and assembly and adjustment benchmark of the full free-form surface multi reflection Off-axis optical system, has strong operability, reduces the difficulty of assembly and integration, and the comprehensive measurement accuracy is better than 0.01 mm. The wave aberration RMS of the final refrigeration relay long wave infrared camera system is better than 0.45 λ @ 632.8nm, meeting the design specifications.

Proceedings Article | 15 February 2022 Paper

Athermalization design of compact dual-fields middle infrared optical zoom system with high-speed switching

Chao Mei, Jia-Qi Fei, Ying-Jun Ma, Hong-Wei Zhang

Proceedings Volume 12166, 121661N (2022) https://doi.org/10.1117/12.2612267

KEYWORDS: Zoom lenses, Mid-IR, Reflection, Imaging systems

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Mid-wave infrared imaging has the advantages of all day, high resolution, strong adaptability to the environment, so it is widely used. In high-speed target tracking and aiming. The target flying speed is extremely fast and the DOF (depth of field) of the fixed focal lens is limited, so the zoom lens is required. In order to ensure that the tracking target will not be lost, a fast zoom requirement of no more than 0.3s is proposed. According to the requirements, a compact athermalized mid-wave infrared dual field fast zoom lens is designed. The focal length is 400 mm and 200 mm, and the passive athermalization design is adopted which can meet the working temperature of - 40° to + 60°. the lens can match the cooling detector with effective pixel of 640 × 512, size of 15 μm and F/4 .The volume of the detector can be controlled in the range of L (196mm) × w (116mm) × H (185mm). The zoom group structure is considered in the design, and the switching time is less than 0.12s, and the image plane is stable when the zoom group switching.

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