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泄漏率测量类似飞行火星2020年的样品管

Jeffrey T Osterhout¹, Kenneth A Farley^1,2, Meenakshi Wadhwa^1,3

¹NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.

|December 18, 2023

概括

美国国家航空航天局NASA NASA

科学领域:

行星科学行星科学
天体生物学天体生物学
材料科学材料科学材料科学

背景情况:

美国宇航局的Perseverance探测器收集火星样本,以便有可能返回地球.
密封的样本管可以最大限度地减少污染和改变.
以前的泄漏率检测极限对于一些科学目标来说是不够的.

研究的目的:

为了研究火星2020的 (He) 泄漏率,采用更敏感的技术采样管.
为了确定泄漏率是否足够低,以保持样本的完整性.

主要方法:

使用静态模式质谱仪测量He泄漏率.
在室温下测试了六个飞行样式样本管.
在温度范围 (-51°C至+42°C) 中分析了一个样本管.

主要成果:

室温 He 的泄漏率从 8.8 × 10 ^{-17 ^{到 4.6 × 10 ^{-14 scc/s.}}}
取决于温度的泄漏率从1.7×10−15到1.4×10−13秒不等.
所有测试的管道均显示泄漏率低于10-13 scc/s.

结论:

火星2020样品管的密封非常非常密封.
测量的泄漏率是可以忽略不计的,确保最小的气体交换.
样本的完整性很可能会保持在未来的分析中.

关键词:

泄漏率的泄漏率是多少火星火星火星火星火星样本返回的回报是样本.样本管的样本管是什么样子密封密封密封密封密封密封密封

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