Dr. Che Liu Profile

Dr. Che Liu

at Changchun Univ of Science and Technology

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Publications (3)

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Proceedings Article | 27 March 2022 Paper

A new structure of synthetic aperture system

Zhen Xu, XingLong Li, Che Liu, Jianguo Tian, Wei Zhu

Proceedings Volume 12169, 1216968 (2022) https://doi.org/10.1117/12.2624736

KEYWORDS: Imaging systems, Modulation transfer functions, Point spread functions, Integrated optics, Synthetic aperture imaging

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The optical synthetic aperture imaging system based on integrated optics obviously decreases the dimension and weight by integrating thousands of micro-lenses and optical waveguide arrays on a planar substrate, but the structure of aperture array is still one of the important factors affecting the imaging quality of system. Therefore, a new micro-lenses array of the optical synthetic aperture imaging system is proposed as micro-lenses array in the shape of windmill which in front of the integrated optical interference system. The theoretical basis of synthetic aperture imaging system is introduced. Build the mathematical model of “windmill” and SPIDER micro-lenses array. Use computer digital simulation experiment to calculate and compare about the peak signal-to-noise ratio (PSNR) and modulation transfer function (MTF) of two kinds of synthetic aperture structure. The experimental results show that the new structure has the advantage of easy fabrication, and the imaging quality is better than the others.

Proceedings Article | 12 March 2021 Paper

Design of off-axis four-mirror optical system based on vector aberration theory

Che Liu, Lei Zhang, Peng Liu, Xinglong Li, Zhen Xu, Jianguo Tian

Proceedings Volume 11763, 117639P (2021) https://doi.org/10.1117/12.2587888

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Reflective optical systems have many advantages such as no chromatic aberration, wide detection band range, suitable for large aperture, light weight and compact structure. More and more two-mirror and three-mirror optical systems have been applied widely, which greatly promotes the development of space optical detection technology. With the continuous development of optical design, in order to increase the field of view, eliminate stray light and compact systems structure, some off-axis four mirror optical systems have been designed. Based on the vector wave-front aberration theory of reflective optical systems, a design method of off-axis four-mirror optical system is proposed in this paper. This method is more intuitive in aberration optimization and can greatly improve the design efficiency of optical system. At last, by using of the optical design software CODE V, a four-mirror optical system with the off-axis field of view is designed.

Proceedings Article | 12 March 2021 Paper

Study on alignment technology of off-axis four-mirror optical systems based on vector aberration theory

Che Liu, Lei Zhang, Xinglong Li, Mingqian Shi, Peng Liu, Zhen Xu

Proceedings Volume 11763, 117639O (2021) https://doi.org/10.1117/12.2587871

Read Abstract +

The image quality of reflective optical systems is influenced strongly when the position of each mirror changed compared to the theoretical design state. Since multiple degrees of freedom in reflective optical system and the interaction between each mirror coupled, which makes it difficult to separate the misalignment of each mirror accurately. By now, vector wave-front aberration theory has been used to computer-aided alignment of two-mirror and three-mirror optical systems widely, however, due to actual engineering demands, optical systems with more than three mirrors have been designed, which greatly increases the difficulty of installation and alignment. At present, there are still few researches on this aspect. Based on vector wave aberration theory, the aberration shift vector of each element in four-mirror optical systems with off-axis field is derived by using paraxial ray trace equation of the optical axis ray and the principle ray, then the misalignment model of the four-mirror optical systems with shifted field is established in detail. The model can accurately calculate the misalignment of optical elements, which greatly promotes the high-precision alignment of complex reflective optical systems. And the perturbed off-axis four-mirror telescope can be perfectly aligned in terms of the vector aberration theory. This greatly facilitates the optical design technology of complex reflective optical systems in some way.

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