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Measurements of high-contrast starshade performance in the field

机译：实地测量高对比度星光表现

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The external starshade is a method for the direct detection and spectral characterization of terrestrial planets around other stars, a key goal identified in ASTRO2010. In an effort to validate the starlight-suppression performance of the starshade, we have measured contrast better than l×10~(-9) using 60 cm starshades at points just beyond the starshade tips. These measurements were made over a 50% spectral bandpass, using an incoherent light source (a white LED), and in challenging outdoor test environments. Our experimental setup is designed to provide starshade to telescope separation and telescope aperture size that are scaled as closely as possible to the flight system. The measurements confirm not only the overall starlight-suppression capability of the starshade concept but also the robustness of the setup to optical disturbances such as atmospheric effects at the test site. The spectral coverage is limited only by the optics and detectors in our test setup, not by the starshade itself. Here we describe our latest results as well as detailed comparisons of the measured results to model predictions. Plans and status of the next phase of ground testing are also discussed.
机译：外部恒星阴影是一种直接检测和光谱表征其他恒星周围的地球行星的方法，这是ASTRO2010确定的主要目标。为了验证恒星的抑制星光性能，我们在距恒星尖端不远的位置使用60 cm恒星测量了优于l×10〜（-9）的对比度。这些测量是使用不相干的光源（白色LED）在50％的光谱带通上进行的，并且是在充满挑战的户外测试环境中进行的。我们的实验装置旨在为望远镜分离和望远镜孔径尺寸提供恒星阴影，并使其与飞行系统尽可能接近。这些测量不仅确认了星光概念的整体抑制星光的能力，而且还确认了设置对测试现场的大气干扰等光学干扰的鲁棒性。在我们的测试装置中，光谱覆盖范围仅受光学和检测器的限制，而不受星影本身的限制。在这里，我们描述了我们的最新结果以及测量结果与模型预测的详细比较。还讨论了地面测试下一阶段的计划和状态。

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