We present a micro star tracker with curved vanes that offers a short length of the baffle and a sharp cutoff of stray light. The curved vanes are derived mathematically by ray-tracing in such away that all the stray light from outside of the desired field of view (FOV) is reflected out. The proposed curved vane design allows a smaller number of vanes to completely cut off stray light, leading to a shorter length in baffle design. Furthermore, the capability of a sharp cutoff of stray light eases the sensitivity requirement of image sensors. For the experiment, we fabricated three micro star tracker baffles with curved vanes for 22 degrees FOV, which are required to handle a maximum star magnitude of 5.35 for 100% sky coverage. The sizes of the baffles fabricated are 16 mm Phi x 16.5 mm L with double curved vanes, 24 mm Phi x 12.1 mm L with a single curved vane, and 27 mm Phi x 14.4 mm L with double curved vanes. In comparison, the straight vane baffle designed for 22 degrees FOV requires seven vanes with 18 mm length but results only in mild stray light attenuation with the cutoff at 32 degrees. The proposed star tracker utilizes a 5-megapixel image sensor, 16 mm x 16 mm x 39 mm in size and weighing 9.2 g with an accuracy of 1.288 arcsecond, a 20.6% improvement over when no baffle is used. (C) 2020 Optical Society of America
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机译：我们展示了一个带有弯曲叶片的微星跟踪器，可提供短长度的挡板和横向剥离的尖锐截止值。弯曲的叶片通过在诸如在所需视场（FOV）外部的所有杂散光（FOV）之外的射线跟踪来衍生数学上。所提出的弯曲叶片设计允许较少数量的叶片完全切断杂散光，导致挡板设计中的较短长度。此外，杂散光截止的能力可以减轻图像传感器的灵敏度要求。对于实验，我们制造了具有弯曲叶片的三个微星跟踪器挡板，用于22度FOV，需要处理100％天空覆盖的最大星级为5.35。制造的挡板的尺寸为16毫米PHI x 16.5 mm l，双弯曲叶片，24mm phi x 12.1 mm l，单个弯曲的叶片，27 mm phi x 14.4 mm l，具有双弯曲叶片。相比之下，设计用于22度FOV的直叶片挡板需要具有18毫米长的七个叶片，但是仅在32度的截止值中产生温和的杂散光衰减。所提出的明星跟踪器利用500万像素图像传感器，尺寸为500万像素图像传感器，16mm×16mm×39mm，重量为9.2克，精度为1.288 arcsecond，当没有使用挡板时的改善20.6％。 （c）2020美国光学学会
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