Mr. Ting-yun Luo Profile

Ting-yun Luo

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Proceedings Article | 18 December 2023 Paper

Lightweight design and analysis on thermal door of remote sensing satellite camera in low earth orbit

Baocheng Zou, Yanhui Jiang, Hui Zhao, Zhiqing Song, Tingyun Luo, Haibo Zhao

Proceedings Volume 12964, 129640G (2023) https://doi.org/10.1117/12.3007634

KEYWORDS: Satellites, Cameras, Design and modelling, Remote sensing, Reliability, Vibration, Finite element methods, Safety, Magnetism, Thermal effects

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Remote sensing satellite in low earth orbit is a kind of spacecraft developed to meet the needs of high-resolution imaging observation, rapid response to emergency earth observation and disaster image monitoring. In this paper, a finite element model of a remote sensing satellite camera with a diameter of 800mm thermal protection door (thermal door for short) was established. The topological optimization design technology is used to design the thermal door structures with high-reliability, high-strength and ultra-light. After optimization, the weight of thermal door is 4.5Kg. The finite element simulation analysis is carried out on the thermal door, and the analysis results show that the thermal door meets the harsh mechanical conditions of a satellite platform. The mechanical test of thermal door was carried out, and the test results match the simulation analysis results. After the mechanical test, the thermal boundary and vacuum conditions in orbit were simulated in the thermal vacuum experiment tank, and the thermal door’s opening and closing tests were carried out. The thermal door’s opening/closing time, opening/closing speed, structural stability and positioning accuracy meet the index requirements. This thermal door has been developed and delivered to the satellite. The research results of this paper have a certain reference value for the design of thermal door for remote sensing satellite cameras with low power consumption and high temperature control requirements..

Proceedings Article | 10 January 2018 Paper

The design research of the test support structure for a large-diameter main mirror

Jiao-hong Shi, Shi-kui Luo, Hai-pei Ren, Lu Tang, Ting-yun Luo, Yi-feng Mao

Proceedings Volume 10616, 106160E (2018) https://doi.org/10.1117/12.2296848

KEYWORDS: Mirrors, Teeth, Mirror structures, Cameras, Silicon carbide, Adhesives, Nanolithography, Numerical simulations, Photovoltaics, Error analysis

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The accuracy of the main mirror surface shape measurement on ground is vital because of the importance of the main mirror in a optical remote sensor. Generally speaking, the main effects of the mirror surface shape measurement accuracy are due to the optical measurement system and support structure. The aim of this thesis is researching the design of the mirror shape measurement support structure. The main mirror discussed in this paper equipped with 650mm diameter. The requirements of PV and RMS for surface shape are no more than 0.136λ and 0.017λ respectively while λ is determined as 632.8nm. At present, the on ground adjustment methods of camera lens are optical axis horizontal and gravity discharging. In order to make the same condition between camera lens adjustment and main mirror operating, the surface shape measurement of main mirror should keep optical axis horizontal condition for mirror either.

The support structure of the mirror introduced in this paper is able to extremely reduce the surface shape distortion caused by the effects of support structure mostly. According to the simulating calculation, the variation of main mirror surface shape is no more than 0.001λ. The result is acceptable for camera adjustment. Based on the measurement support structure mentioned before, the main mirror could rotate 360-degree under the condition of optical axis horizontal; the four-direction measurement for mirror is achieved. Eliminate the effects of ground gravity for surface shape measurement data, the four-direction mirror shape error is controlled no more than 0.001λ on this support structure which calculated by simulation.

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