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MIMA, a miniaturized infrared spectrometer for Mars ground exploration: part Ⅲ, thermomechanical design

机译:MIMA,用于火星地面探测的微型红外光谱仪:第三部分,热机械设计

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The Mars Infrared MApper (MIMA) is a FT-IR miniaturized spectrometer which is being developed for ESA ExoMars Pasteur mission. MIMA will be mounted on the rover mast and so it must be compact and light-weight. The scientific goals and its optical design are presented in two companion papers [1] [2]; the focus of this work is on the thermomechanical design and testing. The instrument design faces challenging constraints both from the expected environment and the allocated resources. The temperatures during operation are expected to be from -120℃ to +30℃ with the presence of a low density but thermally effective atmosphere. Severe dynamic loads are foreseen during launch and moreover at landing on Mars. The overall size is limited to an envelope of 140 mm × 140 mm × 120 mm and the mass to less than 1 kg. The expected performances of this instrument should be comparable with those of much heavier ones built in the past. An instrument compliant with these constraints has been conceived, introducing many innovative solution with respect to the past experiences and making use of intensive modeling and testing to prove the survival to the harsh environment. Among the most challenging problems the mounting of the brittle KBr optics and the matching of its thermal expansion coefficient with that of the supporting aluminium structure, in a temperature interval of more than 200℃. Most of the components have undergone thermovacuum tests in the low temperature range because none of them was expected to be used in the -100℃ range.
机译:火星红外MApper(MIMA)是一款FT-IR微型光谱仪,专为ESA ExoMars Pasteur任务而开发。 MIMA将安装在流动站桅杆上,因此它必须紧凑且重量轻。科学目标及其光学设计在两篇配套论文中提出[1] [2];这项工作的重点是热机械设计和测试。仪器设计面临来自预期环境和分配资源的挑战性约束。在低密度但热有效的气氛下,运行期间的温度预计为-120℃至+30℃。预计在发射期间以及在火星着陆时将承受巨大的动态载荷。整体尺寸限制在140 mm×140 mm×120 mm的信封内,质量不得超过1 kg。该仪器的预期性能应与过去制造的较重的性能相当。已经构想出了一种符合这些限制条件的仪器,它根据过去的经验引入了许多创新的解决方案,并利用密集的建模和测试来证明在恶劣环境下的生存能力。在200℃以上的温度区间中,脆性KBr光学器件的安装以及其热膨胀系数与支撑铝结构的匹配是最具挑战性的问题。大多数组件都已在低温范围内进行了热真空测试,因为预计它们都不会在-100℃范围内使用。

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