JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
Other TitleDevelopment of the shutter system dedicated for ultra-small missions
Author(jpn)吉岡, 和夫; 桑原, 正輝; 疋田, 伶奈; 荒尾, 昇吾; 吉川, 一朗
Author(eng)Yoshioka, Kazuo; Kuwabara, Masaki; Hikida, Reina; Arao, Shogo; Yoshikawa, Ichiro
Author Affiliation(jpn)東京大学; 宇宙航空研究開発機構宇宙科学研究所太陽系科学研究系(JAXA)(ISAS); 東京大学; 東京大学; 東京大学
Author Affiliation(eng)The University of Tokyo; Department of Solar System Sciences, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS); The University of Tokyo; The University of Tokyo; The University of Tokyo
Issue Date2019-02-18
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構研究開発報告
JAXA Research and Development Report
Start page1
End page9
Publication date2019-02-18
Abstract飛翔体搭載の光学観測装置において, 性能を維持するためのコンタミネーション管理や, 意図せぬ太陽光入射による光学素子の損傷への対策は重要である. 打ち上げ前の輸送時や環境試験時, もしくは軌道上運用中に一時的な無制御状態に陥る際には, 装置の蓋を閉じるなどして光学素子を守る必要がある. しかし, 重量や寸法に厳しい制約のある超小型探査機では, 包絡域の問題や仕組みの複雑性のため, 自在に開閉できる蓋の搭載は現実的ではないと考えられていた. そこで我々は超小型探査機にも応用可能な, 省スペースかつ単純な仕組みの絞り型の蓋を開発した. 開閉駆動にはジュール熱で自己収縮する形状記憶合金製バネを採用し, さらに蓋の開閉状況を確認するための小型センサも実装した. また, -20度Cから+50度Cまでの温度環境下で真空動作試験を実施し, 最適な運用条件を確立した. 本研究を通して開発された蓋開閉システムは, 2020年の打ち上げを目指して開発中の超小型探査機に搭載される極端紫外望遠鏡に実装される.
For the optical instruments mounted on spacecraft, the contamination management for maintaining performance and the countermeasures against damage due to unintended sunlight incidence are important. During the ground transportation or environmental tests, or the transient uncontrolled state in orbit, the optical elements must be protected by closing the lid of the instrument. However, for the ultra-small spacecraft with severe restrictions on weight and size, mounting a lid-like structure that can be freely opened and closed has been thought to be unrealistic due to the problem of the large envelope area and the complexity of the mechanism. Here we show a new technique of a diaphragm-type lid with space-saving and simple mechanism, which can be applied to the ultra-small spacecraft. As the opening and closing system, springs made of shape memory alloy which self-shrink with Joule heat have been adopted, and small sensors for checking the opening/closing state of the lid have been also mounted. We have conducted the operation tests under vacuum environment from -20 C to +50 C to establish the optimum operating conditions. The lid opening and closing system developed through this research will be installed in the extreme ultraviolet telescope mounted in the ultra-small spacecraft under development for the launch in 2020.
Description形態: カラー図版あり
Physical characteristics: Original contains color illustrations
Keywordsultra-small mission; shutter; optics; contamination
Document TypeTechnical Report
JAXA Category研究開発報告
NASA Subject CategoryInstrumentation and Photography
Report NoJAXA-RR-18-007

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