Mr. Zhaohui Li Profile

Zhaohui Li

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Proceedings Article | 3 June 2024 Paper

Measurement of deep hole verticality by monocular vision

Hui Zhu, Hua Li, Wei Liu, Zhaohui Li, Wenlong Tan

Proceedings Volume 13182, 131820B (2024) https://doi.org/10.1117/12.3030360

KEYWORDS: Visualization, Matrices, Cameras, Visual optics, Reflection, Optical surfaces, Visual system, Imaging systems, Lithium, Visual analytics

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To propose a measurement method for the verticality of deep hole based on monocular vision.The coordinate conversion matrix of pentaprism circumferential scanning is derived, and the circumferential scanning trajectory and characteristics of the targets are simulated and analyzed .Based on the visual axis, the normal direction of the measurement datum is constructed to accurately compensate the error between the camera visual axis and the tube datum.For the simulated tube with a radius of 956.21mm, a thickness of 999.55mm and a verticality of 0 mm, the verticality accuracy measured by the system can reach 0.03mm.The actual test shows that the method of measuring the verticality of deep hole with monocular vision is effective and feasible. The system is easy to operate and highly automated, which can greatly improve the measurement efficiency and ensure the measurement accuracy. It is of great significance to the production and measurement of deep holes in nuclear tube sheet.

Proceedings Article | 29 December 2023 Paper

Precision alignment of off-axis multi-reflection optical system based on PSM

Xihong Fu, Zhong Shen, Ping Ruan, Hao Yang, Shifa Kang, Hua Li, Zhaohui Li

Proceedings Volume 12976, 129761Z (2023) https://doi.org/10.1117/12.3009600

KEYWORDS: Reflection, Spherical lenses, Off axis mirrors, Design and modelling, Reflectors, Optical alignment, Imaging systems, Mirrors, Optical surfaces, Laser soldering

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The field of space imaging optics is committed to developing large field of view, large aperture, and unobstructed space optical imaging systems. The structure of optical systems has evolved from coaxial optical systems to off axis optical systems. In order to reduce the difficulty of installation and improve the efficiency of off-axis multi-reflection optical systems, the paper studies the precision installation and adjustment process method of off-axis multi-reflection optical systems on account of the principles of spherical autocollimation and spatial coordinate measurement. Establish global coordinate system based on the optical design and processing benchmark of the off-axis multi-reflection optical system, use a laser tracker and auto-collimation theodolite to accurately locate the elevation and azimuth angles of the reflector, and adjust the optical target ball to the theoretical center point position and align with PSM. Remove the target ball. If the actual center of the spherical mirror is not in the theoretical coordinate position, the position deviation and sharpness between the reflection image point and the point light source can be monitored in real-time, and the posture of the mirror can be precisely adjusted to make its reflection image point coincide with PSM. This process method can achieve high-precision and high-efficiency adjustment of the off-axis multi-reflection optical system. The assembly results show that the spatial coordinate position error between the mirrors in the off-axis multi-reflection optical system is better than 15μm through high-precision spatial coordinate positioning, reference transfer and precision measurement. The angle error is better than 30″, and the center field of view wave aberration RMS=0.034λ@632.8nm, meeting the design specifications.

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