标题： 展开可部署稀疏望远镜 显示英文标题

标题： Phasing a deployable sparse telescope

摘要： 在发射和部署稀疏空间望远镜后，需要进行微调以纠正其元件初始放置的不准确性。我们选择了这些望远镜孔径段的独特形状和位置，以便能够区分它们的衍射图样，同时保证适当的的空间频率覆盖。然后我们改进了组合波前，而没有直接测量它：首先，我们将每个段的焦图像与其独特的模板相关联，以校正其倾斜。接下来，我们利用它们有限的相干性，一对一对地将其与其他段干涉，以确定它们之间的光程差。最后，我们优化了组合焦图像以实现精细对准。 显示英文摘要

摘要： After launching and deploying a sparse space telescope, fine tuning is required to correct for inaccurate initial placement of its elements. We selected unique shapes and locations of these telescope aperture segments, to be able to distinguish between their diffraction patterns, while at the same time having a proper spatial frequency coverage. Then we improved the combined wave front, without measuring it directly: First we correlated each segment's focal image with its distinctive template, to correct its tilt. Next we interfered them with the other segments, pair by pair, using their limited coherence, to locate their mutual optical path differences. Finally, we optimized the combined focal image for fine alignment.