Dr. Yuhang Zhao Profile

Dr. Yuhang Zhao

at Xi'an Univ. of Posts & Telecommunications

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Proceedings Article | 12 April 2023 Paper

Free-form surface reconstruction of off-axis three mirror optical system based on rhino

Lingying Chang, Kui Chen, Yuhang Zhao, Yuehong Qiu, Guanru Wang, Xinyou Wang

Proceedings Volume 12565, 125653S (2023) https://doi.org/10.1117/12.2663242

KEYWORDS: Mirrors, Data modeling, Imaging systems, 3D modeling, Optical simulations, Optical design, Off axis mirrors, Code v, Clouds, Optical components

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With the development of modern space optical system, off-axis reflective system with wide spectrum, high resolution and large field of view has become the main direction of optical design. However, the off-axis property of off-axis reflective structure brings asymmetric aberration, which makes designers use free-form surface frequently to correct the aberration of optical system and improve the imaging quality. When the Trace Pro optical mechanical simulation software cannot accurately convert the optical system with free-form surface in CODE V, it is difficult to simulation stray light and analysis environmental in the subsequent studies. The reconstruction of free-form surface of off-axis three mirror optical systems are realized by Rhino in this paper. For the free-form surface in the off-axis three mirror optical systems designed by CODE V, a uniform circular dot ring array sampling method based on polar coordinates is proposed to obtain the free-form surface point cloud data. The point deviation of 5mm-80mm was analyzed, and the optimal sampling interval for the point cloud data of XY polynomial free-form surface with an aperture of 150mm was determined to be 10mm; The NURBS method is used to reconstruct the free-form surface model in Rhino, and the free-form surface reconstruction of the off-axis three mirror optical system is modeled in Trace Pro. Through the simulation of imaging optical path and the analysis of image point dispersion spot radius, it is verified that the free-form surface model of off-axis three mirror optical system can be reconstructed based on rhino. This research provides an effective method reference for optical mechanical joint simulation analysis.

Proceedings Article | 12 April 2023 Paper

Analysis and suppression of stray light in the pre-optical system based on AOTF imaging spectrometer

Lingying Chang, Yuhang Zhao, Yuehong Qiu, Yitian Wang, Xinyou Wang, Guanru Wang

Proceedings Volume 12565, 125650N (2023) https://doi.org/10.1117/12.2661634

KEYWORDS: Stray light, Mirrors, Imaging systems, 3D modeling, Optical testing, Light scattering, Stray light analysis, Light

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During the observation of the ground by the space optical system, stray radiation will enter and degrade the imaging quality of the optical system. In order to improve the imaging effect of the system, this paper takes the front optical system of an AOTF imaging spectrometer as an example, designs and builds a truss optical machine structure in Pro/E, and completes the optical machine modelling in Trace Pro. The stray light paths were analysed by ray tracing simulation and the important surfaces of the optical machine were identified. The design of external hood and light-blocking rings and the design of the light baffle and the alienated inner hood were carried out respectively. Numerical calculations of PST curves for off-axis angles from 5° to 80° were carried out for each of the three cases by ray tracing without stray light suppression, using only external hood suppression, and using internal and external suppression measures. After comparative analysis, it was determined that the PST value for the use of all strays light suppression measures at an angle greater than 30° was less than the stray light level target value of 10^-7 by two orders of magnitude and less than the PST of the optical machine without stray light suppression by four orders of magnitude, verifying that the stray light suppression method in the paper works well.

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