Cryogenic radiator with cavity-in-cavity structure for space missions

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Shinozaki, Keisuke^1 ; Nishikawa, Ikuma^2^3 ; Tanaka, Kohsuke^1 ; Ando, Makiko^1 ; Sugita, Hiroyuki^1

R and D Directorate, JAXA, 2-1-1, Sengen, Ibaraki, Tsukuba

305-8505, Japan^1

Graduate School of Systems and Information Engineering, University of Tsukuba, 1-1-1, Tennodai, Ibaraki, Tsukuba

305-8577, Japan^2

Present Address: Mitsubishi Space Software Co., Ltd., 792 Kamimachiya, Kamakura Kanagawa

247-0065, Japan^3

关键词: Calorimetric methods;    Cavity structure;    Concept demonstration;    High emissivity;    Infrared wavelengths;    Low temperatures;    Space missions;    Surface cavity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012070/pdf
DOI  :  10.1088/1757-899X/502/1/012070

来源: IOP

【 摘 要 】

A new cryogenic radiator with high emissivity under 50K has been designed, fabricated and tested for space cryogenic missions in which high emissivity radiative cooling at low temperature is proposed. In this design, a cavity is introduced in a cavity surface structure to make a low reflectivity surface at an infrared wavelength (ranging from a few tens of m up to 1000 m) without any black coating resulting in contamination and low reliability at low temperature. As proof of a concept demonstration, a triple-cavity surface structure was designed, and three types of test pieces with different number of surface cavities were measured. Low temperature emissivity measurement using the calorimetric method, revealed that higher emissivity was successfully obtained with the test piece having a higher number of cavities.Published under licence by IOP Publishing Ltd.