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Testing and applicability of the UPC-ZEBRA interferometer as a phasing system in segmented-mirror telescopes

机译：UPC-ZEBRA干涉仪作为分段镜望远镜中的调相系统的测试和适用性

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In segmented-mirror telescopes, wave-front discontinuities caused by segment misalignment are a major problem because they severely degrade optical performance. While angular misalignments are usually measured with deflectometric wave-front sensors (e.g., Shack-Hartmann sensors), a number of techniques have been proposed for the measurement of vertical discontinuities (pistons). In earlier papers we presented an instrument called UPC-ZEBRA that uses a novel interferometric technique to measure piston error during the daytime with an uncertainty of 5 nm within a 30-μm range. Here we present the most representative results obtained during the testing stage and a detailed analysis of error sources. The main modifications to be introduced for the instrument's use as a phasing calibration system are also outlined.
机译：在分段镜望远镜中，由分段未对准引起的波前不连续是一个主要问题，因为它们严重降低了光学性能。尽管通常使用偏转波前传感器（例如，Shack-Hartmann传感器）来测量角度不对准，但是已经提出了许多用于测量垂直不连续性（活塞）的技术。在较早的论文中，我们介绍了一种称为UPC-ZEBRA的仪器，该仪器使用一种新颖的干涉技术来测量白天的活塞误差，其不确定性在30微米范围内为5纳米。在这里，我们介绍了在测试阶段获得的最具代表性的结果以及对错误源的详细分析。还概述了要引入的用于仪器作为相位校准系统的主要修改。

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