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Experimental Study of Starshade at Flight Fresnel Numbers in the Laboratory

机译:实验室中菲涅尔飞行数下星状阴影的实验研究

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A starshade or external occulter is a spacecraft flown along the line-of-sight of a space telescope to suppress starlight and enable high-contrast direct imaging of exoplanets. Because of its large size and scale it is impossible to fully test a starshade system on the ground before launch. Therefore, laboratory verification of starshade designs is necessary to validate the optical models used to design and predict starshade performance. At Princeton, we have designed and built a testbed that allows verification of scaled starshade designs whose suppressed shadow is mathematically identical to that of a comparable space starshade. The starshade testbed uses 77.2 m optical propagation distance to realize the flight-appropriate Fresnel numbers of 14.5. Here we present the integration status of the testbed and simulations predicting the ultimate contrast performance. We will also present our results of wavefront error measurement and its implementation of suppression and contrast.
机译:星状阴影或外部掩星是沿着太空望远镜视线飞行的航天器,用于抑制星光并能对系外行星进行高对比度直接成像。由于其庞大的规模和规模,因此不可能在发射前在地面上对恒星系统进行全面测试。因此,必须对星状罩设计进行实验室验证,以验证用于设计和预测星状罩性能的光学模型。在普林斯顿大学,我们设计并建造了一个试验台,可以验证按比例缩放的星状阴影设计,其隐蔽阴影在数学上与可比的太空星状阴影相同。星状阴影试验台使用77.2 m的光学传播距离来实现与飞行相符的菲涅耳数14.5。在这里,我们介绍了测试平台的集成状态,并通过仿真预测了最终的对比性能。我们还将介绍波前误差测量的结果及其抑制和对比度的实现。

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