莱曼α滤波器原型，以实现莱曼紫外线中的天文学Photometry
Lyman-alpha Filter Prototype to Enable Astronomical Photometry in the Lyman Ultraviolet
摘要：
由于明亮的莱曼-α地冠辐射，从地球轨道上对远紫外天体（FUV波长范围为900- 1800 nm）的观测受到阻碍。约翰·霍普金斯火箭小组正在研制一种氢吸收池，它将作为一种窄带莱曼-α抑制滤光片，以便能够在跨越地冕线短边莱曼紫外区的带通中进行天基光度观测。虽然这一技术已被应用于使用单元件光电倍增管探测器的各种行星飞行任务，但尚未被用于使用多元件探测器的近地轨道卫星。我们正在努力开发一种电池，可以很容易地纳入未来的莱曼紫外线任务。原型电池是一个密封在一对MgF 2窗口之间的低压（~几个微气压）室，允许传输低至1150微气压。它充满了分子氢，在热钨丝的存在下转化为中性原子形式，这允许吸收莱曼-α光子。分子氢储存在一个完全饱和的非蒸发性吸气剂模块（St 707 TM）中，它允许电池压力在适度加热的情况下增加（从室温上升20度，压力从0.6升至10 ℃）。目前正在使用真空紫外单色仪进行测试，以表征细胞对莱曼-α光子的光学深度，作为压力和钨丝电流的函数。我们将介绍这些结果，以及宽带光度应用中的启用科学的讨论。
英文摘要：
Observations of astronomical objects in the far ultraviolet (FUV wavelengths span 900-1800Å) from earth's orbit has been impeded due to bright Lyman-α geocoronal emission. The Johns Hopkins Rocket Group is developing a hydrogen absorption cell that would act as a narrow band Lyman-α rejection filter to enable space-based photometric observation in bandpasses that span over the Lyman ultraviolet region shortward of the geocoronal line. While this technology has been applied to various planetary missions with single element photomultiplier detectors it has yet to be used on near earth orbiting satellites with a multi-element detector. We are working to develop a cell that could be easily incorporated into future Lyman ultraviolet missions. The prototype cell is a low-pressure (~ few torr) chamber sealed between a pair of MgF2 windows allowing transmission down to 1150 Å. It is filled with molecular hydrogen that is converted to its neutral atomic form in the presence of a hot tungsten filament, which allows for the absorption of the Lyman-α photons. Molecular hydrogen is stored in a fully saturated non-evaporable getter module (St707TM), which allows the cell pressure to be increased under a modest application of heat (a 20 degree rise from room temperature has produced a rise in pressure from 0.6 to 10 torr). Testing is now underway using a vacuum ultraviolet monochromator to characterize the cell optical depth to Lyman-α photons as functions of pressure and tungsten filament current. We will present these results, along with a discussion of enabled science in broadband photometric applications.
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