Mr. shang cao Profile

shang cao

at Xi'an Institute of Optics and Precision Mechanics

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Proceedings Article | 8 October 2015 Paper

A concept design of deployable space membrane diffractive telescope

Yaohui Zheng, Ping Ruan, Shang Cao

Proceedings Volume 9678, 96780P (2015) https://doi.org/10.1117/12.2199492

KEYWORDS: Space telescopes, Telescopes, Mirrors, James Webb Space Telescope, Diffractive optical elements, Imaging systems, Diffraction, Phase modulation, Optical instrument design, Astronomical imaging

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The traditional Space Telescope has a tremendous potential shortcoming for very large aperture space telescopes. The total mass of the conventional monolithic mirror will skyrocket along with the increase of the apertures; even so much as cannot be launched to space even with the best current lightweight mirror designs. The use of a membrane diffractive optical element (DOE) can reduce the mass of large space telescopes and achieve as much as a factor of seven in mass savings per unit aperture area compared to lightweight mirrors. The primary lens of this telescope is a transmissive membrane etched with a diffraction pattern that offers a significant relaxation in the control requirements on the membrane surface figure. In 2012, the meter-scale transmissive membrane DOE was successfully developed. In 2014, the brassboard telescope of 5-meter diameter successfully demonstrates the ability to collect polychromatic high resolution imagery over a representative object using the transmissive DOE technology. All in all, the development of diffractive telescope with apertures in excess of 5 meter diameter has been put on the agenda. In this paper we first discuss the diffractive imaging system. Then some traditional deployable space optical systems are analyzed in the aspects of deployment methods and characteristics and a conceptual design for a 10m-diameter diffraction telescope is proposed. At last we talk about the key technologies for membrane diffractive telescope.

Proceedings Article | 2 September 2014 Paper

Dynamics analysis on adhesive bonds of tilt mirror

Shang Cao, Ping Ruan, Chao Wang, Guangzhou Xu

Proceedings Volume 9280, 92800W (2014) https://doi.org/10.1117/12.2068441

KEYWORDS: Mirrors, Adhesives, Finite element methods, Mirror pointing, 3D modeling, Mechanics, Mirror structures, Remote sensing, Satellites, Optical components

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Adhesive bonding technology has been widely applied in the field of space remote sensing. In order to make the adhesive bonds connecting the mirror and the fixed structures in a satellite launch or operation of dynamic environment without damage, the finite element model of the tilt mirror is essential to be established for dynamic analysis, as well as the experimental verification . There are detailed model and the equivalent stiffness model on the adhesive bonds. The modal, frequency response，random vibration and shock response are analyzed through the detailed model of the bonds. The stress of the three point mirror bonds is compared with the six point support mirror. The mechanics experiment is carried out based on the dynamics analysis. The results of calculation demonstrates that the impact of frequency response and random vibration on adhesive bonds is relatively little, while the impact of the shock response is large. The experimental verification shows that the stress of bonds with three points support mirror under shock response exceeds the shear strength, which leads to the separation of the mirror and the fixed structure and the improved six point support mirror is satisfied to the requirements. The dynamics analysis on adhesive bonds of tilt mirror makes sense for designing, assembling and mechanics experiment.

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