A novel technique to measure residual systematic segment piston errors of large aperture optical telescopes
A novel technique to measure residual systematic segment piston errors of large aperture optical telescopes
复制标题
大口径光学望远镜残余系统段活塞误差测量新技术
DOI：
10.1117/12.2313017
复制
发表时间：
2018
影响因子：
4.8
通讯作者：
S. Ragland
中科院分区：
文献类型：
--
作者：
S. Ragland
提出了一种观测和建模技术，以寻找大口径光学望远镜各部分定相过程中可能存在的系统偏差。该技术使用来自自适应光学（AO）科学仪器的天空图像，结合详细的AO建模，对可能的周期性剩余段活塞误差进行预测。该技术在天空中使用凯克II望远镜进行了演示，通过对望远镜部分进行适当的活塞校正，消除了NIRC 2科学图像中的两个明亮斑点。计划在今年夏天进行后续观测，以验证另一个模型的预测，使用这种技术对低阶像差进行观测，以提高AO科学观测的图像质量。讨论了该技术对现有和未来超大型分段望远镜AO观测的意义。
An observational and modeling technique to look for possible systematic bias in the phasing of the segments of a large aperture optical telescope is presented. The technique uses on-sky images from adaptive optics (AO) science instruments in conjunction with detailed AO modeling to make predictions on possible periodic residual segment piston errors. The technique is demonstrated on the sky using the Keck II telescope to cancel two bright speckles seen in the NIRC2 science images by applying appropriate piston corrections to the telescope segments. Follow-up observations are planned for this summer to validate another model prediction, using this technique on low order aberrations to improve the image quality of AO science observations. The significance of the technique for AO observations with the existing and future extremely large segmented telescopes is discussed.