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Cao S.,Science and Technology on Surface Engineering Laboratory | Cao S.,Lanzhou University | Chen X.,Science and Technology on Surface Engineering Laboratory | Wang X.,Science and Technology on Surface Engineering Laboratory | And 2 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2013

A novel type of micro variable radiator was developed for the thermal control of micro/nano satellites to improve the poor thermal performance of the conventional micro variable radiator fabricated with silicon material by conventional processing technology. The newly-developed micro variable radiator with small size, light weight and low power consumption, was fabricated by thin film and laser micr o-processing technologies with polyimide film as the thermal insulation material. The impacts of the various factors, including the emission characteristics of gold film, thickness of polyimide film, structures, and processing techniques, on the thermal performance were experimentally and theoretically evaluated. A prototyped micro variable radiator, fabricated by a combination of ultraviolet laser micro -processing, dip-coating, and magnetron sputtering, was tested. The test results show that the prototyped micro variable radiator has an actuation voltage of 97 V and a variation in radiation power of 0.1 W. Source


Cao S.,Science and Technology on Surface Engineering Laboratory | Chen X.,Science and Technology on Surface Engineering Laboratory | Wang X.,Science and Technology on Surface Engineering Laboratory | Han C.,Science and Technology on Surface Engineering Laboratory | Yang J.,Science and Technology on Surface Engineering Laboratory
Applied Mechanics and Materials | Year: 2012

Micro-variable Radiator with its small volume, light weight and less power consumption quite meets the requirement of Micro/Nano satellite thermal control. Prototypes fabricated by bulk silicon technology have poor thermal performance owing to their confines of material and process. In this paper, a novel micro-radiator based on laser micro processing technology and polymer material was proposed, its operational principle was introduced and the relationship between structural and thermal performance was analyzed theoretically. A prototype was fabricated by UV laser micro-processing, dip-coating and magnetron sputtering technologies. Test results show that the actuation voltage is 97V and variation of radiation power is about 0.1W. © (2012) Trans Tech Publications, Switzerland. Source


Cao S.,Science and Technology on Surface Engineering Laboratory | Chen X.,Science and Technology on Surface Engineering Laboratory | Wu G.,Science and Technology on Surface Engineering Laboratory | Yang J.,Science and Technology on Surface Engineering Laboratory | Wang R.,Science and Technology on Surface Engineering Laboratory
Advanced Materials Research | Year: 2011

Micro and Nano-satellites with their low thermal capacitance are vulnerable to rapid temperature fluctuations. Therefore, thermal control becomes more important, but the limitations on mass and electrical power require new approaches. Possible solutions to actively vary the heat rejection of the satellite in response to variations in the thermal load and environmental condition are the use of variable emissivity devices, such as micro louvers, micro thermal switches, etc. Micro louvers with small volume, low weight, less power consumption and large emissivity variation, will be the more suitable solution for micro and Nano-satellites thermal control. In this paper, a polyimide based micro louver is developed. The device structure was designed, the actuation voltage was analyzed theoretically and fabrication process was described. The main parameters were tested and results were presented. © (2011) Trans Tech Publications. Source

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