Cheffot Anne-Laure, Vigan Arthur, Leveque Samuel, Hugot Emmanuel
Opt Express. 2020 Apr 27;28(9):12566-12587. doi: 10.1364/OE.390576.
The demand for higher resolution telescopes leads to segmented primary mirrors that need to be phased for operation. A phasing sensor applying a wavelength sweep technique provides a large capture range without modulating the position of individual mirror segments. This technique offers the potential to monitor the phasing state of a segmented telescope in parallel to the science observations. We evaluate the performance of the wavelength sweep technique using a Zernike phase contrast sensor for coarse phasing. Test results on a dedicated bench show 112 nm rms precision. With the help of a simulation, we explain a known error of the method and we suggest ways for improvements.
对更高分辨率望远镜的需求导致了需要进行相位调整以进行操作的分段主镜。一种应用波长扫描技术的相位传感器在不调节单个镜段位置的情况下提供了较大的捕获范围。该技术具有在进行科学观测的同时监测分段望远镜相位状态的潜力。我们使用用于粗相位调整的泽尼克相衬传感器评估了波长扫描技术的性能。在专用试验台上的测试结果显示均方根精度为112纳米。借助模拟，我们解释了该方法的一个已知误差，并提出了改进方法。
