Cryogenic radiator with cavity-in-cavity structure for space missions. (April 2019)

• Record Type: Journal Article
• Authors: Shinozaki, Keisuke; Nishikawa, Ikuma; Tanaka, Kohsuke; Ando, Makiko; Sugita, Hiroyuki
• Is Part Of: IOP conference series. Volume 502(2019)
• Publication Date: 2019-04
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/502/1/012070
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: 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 μ m up to 1000 μ 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.