18 December 2014 Research on reverse association mechanism of the thermal control performance of conducting optical solar reflector and its antistatic properties
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Abstract
As we know, optical solar reflector (OSR) is used as the thermal control element for communications satellites and other spacecraft. The solar absorption, infrared emissivity and their ratio of OSR, are considered as the main standard of its thermal control performance. OSR is divided into conducting OSR and non-conducting OSR. When using the indium tin oxide (ITO) film coated on the surface of conducting OSR's glass substrate, ITO film will improve OSR's solar absorption rate and reduce the infrared emissivity. That means the thermal control performance will be declined. The paper is aimed to revealing the reverse association mechanism between the thermal control performance of conducting OSR used for spacecraft and the antistatic properties of ITO film. First, we combined the Drude theory with the Thermal radiation theorem to analyze how the antistatic parameters of ITO film impact the solar absorption and the infrared emissivity of OSR. Then,based on the theoretic analysis of main antistatic parameters of ITO, including the surface square resistance, secondary electron emission characteristic, solar absorption rate, infrared emissivity and other optical and electrical parameters. It illustrated that those factors have a strong reverse connection with the thermal control parameters of OSR, and influenced the solar absorption, infrared emissivity and their ratio of OSR. Comparison of the predicted and experimental results demonstrate that when reducing the surface square resistance of the ITO film, the antistatic properties was declined, and increased the value of the OSR solar absorption. On the contrary, reducing the infrared emissivity, It would result in the degradation of OSR's thermal control performance. The study has performed that the reverse association mechanism of conducting OSR can't be ignored. And apparently it shows that if we want to keep its application in the spacecraft thermal control environment and antistatic properties long-term stable, the antistatic parameters principles of ITO film need to be designed reasonably.
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Tianhai Chang, Shuling Wu, Zheng Xing, Xiaoqun Wei, "Research on reverse association mechanism of the thermal control performance of conducting optical solar reflector and its antistatic properties", Proc. SPIE 9295, International Symposium on Optoelectronic Technology and Application 2014: Laser Materials Processing; and Micro/Nano Technologies, 929502 (18 December 2014); doi: 10.1117/12.2070605; https://doi.org/10.1117/12.2070605
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