Mr. Wenqiang Yang Profile

Wenqiang Yang

at Xi'an Institute of Optics And Precision Mechanics

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Publications (3)

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Proceedings Article | 11 January 2019 Paper

Mechanical design of zoom optical system for deep space exploration

Chongsen Qian, Fu Li, Jianfeng Yang, Yi Sun, Wenqiang Yang

Proceedings Volume 10837, 1083704 (2019) https://doi.org/10.1117/12.2504761

KEYWORDS: Zoom lenses, Titanium, Aluminum, Thermal effects, Finite element methods, Mechanical engineering, Temperature metrology, Aerospace engineering

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As one of the largest aerospace countries in the world, China’s National Space Administration has officially launched the China Mars Exploration Project in 2016. The zoom lens, in contrast to a fixed focal length lens, has a continuously variable focal length that provides more intuitive information for probing activities. Therefore, it is particularly important to design a zoom lens and use it as a Mars probe imaging payload. In this paper, a zoom system is designed for the climatic environment of Mars and the condition requirements of the lander during transportation work. At the same time, different types of structures were discussed. Finally, a cam rotation mechanism was used in the zoom mechanism. Examining the complexity of the space thermal environment, the thermal characteristics of the system structure will have a great impact on the system performance. To prevent the adverse effects of different thermal expansion coefficients on the system over a wide operating temperature range, select the appropriate materials and the overall structure It is very important to carry out finite element analysis. In this paper, thermal deformation analysis of Aluminum Alloys, Titanium Alloys and Invar Steel materials was performed. The results show that the thermal deformation of Aluminum Alloy materials is maximum at the working temperature of -55°C to +55°C, the thermal deformation of the Aluminum Alloy material is the largest, and the titanium alloy and Invar Steel are relatively small. Finally, the axial displacement is analyzed. The analysis results show that Invar Steel material has the smallest axial displacement. However, considering the weight reduction, it has met the rocket launch requirements. Finally, titanium alloy material is used as the system structural material, and the cam curve is compensated according to the axial displacement.

Proceedings Article | 24 October 2017 Paper

Thermal effects of optical antenna under the irradiation of laser

Yi Sun, Fu Li, Wenqiang Yang, Jianfeng Yang

Proceedings Volume 10463, 104631F (2017) https://doi.org/10.1117/12.2285378

KEYWORDS: Optical antennas, Thermal effects, Laser optics, Laser communications, Laser irradiation, Satellite communications, Satellites

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The laser communication terminal is a precision optical, mechanical, electrical integration device which operations extremely high accuracy. It is hard to improve the space environment adaptability in the hash vibration, thermal cycling, high vacuum and radiation conditions space environment. Accordingly, the optical antenna will be influenced by space thermal environment. Laser energy will be absorbed when optical antenna under the irradiation of laser. It can contribute to thermal distortion and make the beam quality degradation which affects the performance of laser communications links. This influence will aggravate when the laser power rising.Wavefront aberration is the distance between the ideal reference sphere and the actual distorted wavefront. The smaller the wavefront aberration, the better the optical performance of the optical antenna. On the contrary, the greater the wavefront aberration, the worse the performance of the optical antenna or even affect the normal operation of the optical antenna. The performance index of the optical antenna generally requires the wavefront aberration to be better than λ/20. Due to the different thermal and thermal expansion coefficients of the material, the effect of thermal deformation on the optical antenna can be reduced by matching the appropriate material. While the appropriate support structure and proper heat dissipation design can also reduce the impact. In this paper, the wavefront aberration of the optical antenna is better than λ/50 by the material matching and the appropriate support structure and the secondary design of the diameter of 5mm hole thermal design.

Proceedings Article | 24 October 2017 Paper

Optomechanical integrated simulation of Mars medium resolution lens with large field of view

Wenqiang Yang, Guangzhou Xu, Jianfeng Yang, Yi Sun

Proceedings Volume 10463, 104631I (2017) https://doi.org/10.1117/12.2285582

KEYWORDS: Mars, Zernike polynomials, Thermal analysis, Finite element methods, Optomechanical components

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The lens of Mars detector is exposed to solar radiation and space temperature for long periods of time during orbit, so that the ambient temperature of the optical system is in a dynamic state. The optical and mechanical change caused by heat will lead to camera's visual axis drift and the wavefront distortion. The surface distortion of the optical lens includes the displacement of the rigid body and the distortion of the surface shape. This paper used the calculation method based on the integrated optomechanical analysis, to explore the impact of thermodynamic load on image quality. Through the analysis software, established a simulation model of the lens structure. The shape distribution and the surface characterization parameters of the lens in some temperature ranges were analyzed and compared. the PV / RMS value, deformation cloud of the lens surface and quality evaluation of imaging was achieved. This simulation has been successfully measured the lens surface shape and shape distribution under the load which is difficult to measure on the experimental conditions. The integrated simulation method of the optical machine can obtain the change of the optical parameters brought by the temperature load. It shows that the application of Integrated analysis has play an important role in guiding the designing the lens.

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