Microelectromechanical devices for satellite thermal control
Microelectromechanical devices for satellite thermal control
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DOI：
10.1109/jsen.2004.830297
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发表时间：
2004-08-01
影响因子：
4.3
通讯作者：
Darrin, MAG
中科院分区：
文献类型：
--
作者：
Osiander, R;Firebaugh, SL;Darrin, MAG
未来的空间飞行任务将包括航天器星座，其中包括超小型卫星和微微卫星，在这些星座中，将需要适应性热控制系统，以适应空间应用的局限性和有限的功率和质量预算。已经开发了一种微机电系统解决方案，该解决方案将改变小型卫星辐射器表面的发射率。该系统是基于恒温控制器，其中面板的机械定位，以调节有效的散热器表面积。该系统由MEMS阵列的镀金滑动百叶窗，制作与桑迪亚超平面，多层MEMS技术制造工艺，利用多层多晶硅表面微加工。快门可以独立操作，以允许有效发射率的数字控制。这第一个演示技术是有限的，在可能的发射度范围内的40%的变化。远离结构打开的MEMS百叶窗的早期原型已经显示出更宽的动态范围的能力。第一代主动热管理系统将在美国宇航局的新千年计划ST-5航天器上进行演示。有机会在ST-5上验证MEMS热控制技术，重量轻，低功耗，MEMS辐射器为未来纳米卫星的灵活热控制提供了可能性。
Future space missions will include constellations of spacecraft, including nano- and picosatellites, where adaptive thermal control systems will be needed that fit the constraints of space applications with limited power and mass budgets. A microelectromechanical systems (MEMS) solution has been developed that will vary the emissivity on the surface of the small satellite radiator. The system is based on louver thermal controllers, where panels are mechanically positioned to modulate the effective radiator surface area. This system consists of MEMS arrays of gold-coated sliding shutters, fabricated with the Sandia ultraplanar, multilevel MEMS technology fabrication process, which utilizes multilayer polycrystalline silicon surface micromachining. The shutters can be operated independently to allow digital control of the effective emissivity. This first demonstrator technology is limited in the possible emittance range to a 40% change. Early prototypes of MEMS louvers that open away from the structure have shown the capability of a much wider dynamic range. The first generation of this,active thermal management system will be demonstrated on NASA's New Millennium Program ST-5 spacecraft. With the opportunity to validate the MEMS thermal control technology in space on ST-5, lightweight, low-power, MEMS radiators offer a possibility for flexible thermal control on future nanosatellites.