Mr. Qiang Zhao Profile

Qiang Zhao

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Proceedings Article | 11 January 2019 Paper

Curing shrinkage stress and deformation analysis of adhesive bonding large aperture mirror

Li-jun Sun, Li-bo Li, Si-yuan Li, Qiang Zhao, Jian Sun, Jun-qiang Wu, Bing-liang Hu

Proceedings Volume 10837, 108370J (2019) https://doi.org/10.1117/12.2505710

KEYWORDS: Mirrors, Adhesives, Finite element methods, Mirror structures, Shape analysis, Modal analysis, Analytical research

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The influence of adhesive bonding and curing on the accuracy of mirror surface shape was analyzed to realize low-stress assembly of large aperture mirror. Firstly, based on Hooke's law, a curing shrinkage stress equation was deduced, taking deformation of the mirror and support structure into account under the boundary condition of continuous edge bond, and key parameters effecting mirror deformation were obtained. Secondly, for a 514mm ULE spectrometer primary mirror with an inserts structure mosaiced and bonded on mirror-back, an equivalent linear expansion coefficient method was used for finite element modeling. The shrinkage stress at the bond edge of mirror and the mirror surface shape were analyzed. It’s found that adhesive shrinkage has a significant effect on the mirror surface shape. Finally, the inserts structure of mirror assembly was optimized. In contrast to the non-optimum structure, the average stress of adhesive surface caused by adhesive curing shrinkage reduced from 0.28MPa to 0.18MPa, and the mirror surface shape (Root Mean Square, RMS) reduced from 0.029λ to 0.017λ. Finite element analysis results of the mirror assembly were given at last, surface shape accuracy (RMS) of mirror is 0.012λ under a load case of 1g gravity, and the first-order natural frequency of the component is 216 Hz. The obtained results showed that a suitable optimized support structure can effectively relieve adhesive curing stress, and also satisfy the design requirements for both the static and dynamic stiffness.

Proceedings Article | 28 February 2017 Paper

Influence analysis of satellite drift angle on spectrum recovery precision of large aperture static interferometer spectrometer

Siyuan Li, Huan Liu, Geng Zhang, Zhoufeng Zhang, Qiang Zhao

Proceedings Volume 10256, 102560W (2017) https://doi.org/10.1117/12.2256460

KEYWORDS: Satellites, Spectroscopy, Interferometers, Sensors, Target detection, Satellite imaging, Image restoration, Data analysis

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Large aperture static interferometer spectrometer (LASIS) use the method of push-boom to get the geometric and spectral characteristics of ground target, the particularity of principle requires the movement of satellite must be in the same direction with spectrometers detectors. Drift angle of satellite leading to abnormal image shifts in the column direction which should be perpendicular to the detector and can seriously affect the spectrum recovery precision of collected data. This paper analyzes the influence mechanism of drift angle for spectrum recovery precision. Simulation based on the actual on-orbit data analyses the effects of different drift angle of relative mean deviation and relative secondary deviation rehabilitation of the spectrum, besides the influence of spectral angle similarity. These studies have shown that, when the lateral deviation due to the drift angle on the across track is less than 0.3 pixel, the effect for the relative mean deviation of the inversive spectra will be no more than 7%. when the lateral deviation due to the drift angle on the across track is larger than one pixel, even though the resampling correction is proceeded, the restored spectral data cube still shows an relative mean error more than 10%, which seriously affect the availability of spectral data.

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