首页> 外文OA文献 >Lyot-based Low Order Wavefront Sensor for Phase-mask Coronagraphs: Principle, Simulations and Laboratory Experiments
【2h】

Lyot-based Low Order Wavefront Sensor for Phase-mask Coronagraphs: Principle, Simulations and Laboratory Experiments

机译:用于相位掩模Coronagraphs的基于Lyot的低阶波前传感器:   原理,模拟和实验室实验

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

High performance coronagraphic imaging of faint structures around brightstars at small angular separations requires fine control of tip, tilt and otherlow order aberrations. When such errors occur upstream of a coronagraph, theyresults in starlight leakage which reduces the dynamic range of the instrument.This issue has been previously addressed for occulting coronagraphs by sensingthe starlight before or at the coronagraphic focal plane. One such solution,the coronagraphic low order wave-front sensor (CLOWFS) uses a partiallyreflective focal plane mask to measure pointing errors for Lyot-typecoronagraphs. To deal with pointing errors in low inner working angle phase maskcoronagraphs which do not have a reflective focal plane mask, we have adaptedthe CLOWFS technique. This new concept relies on starlight diffracted by thefocal plane phase mask being reflected by the Lyot stop towards a sensor whichreliably measures low order aberrations such as tip and tilt. This reflectiveLyot-based wavefront sensor is a linear reconstructor which provides highsensitivity tip-tilt error measurements with phase mask coronagraphs. Simulations show that the measurement accuracy of pointing errors withrealistic post adaptive optics residuals are approx. 10^-2 lambda/D per mode atlambda = 1.6 micron for a four quadrant phase mask. In addition, we demonstratethe open loop measurement pointing accuracy of 10^-2 lambda/D at 638 nm for afour quadrant phase mask in the laboratory.
机译:明亮的恒星周围的微弱结构以小角度间隔进行高性能电晕成像需要对尖端,倾斜和其他低阶像差进行精细控制。当这样的错误发生在日冕仪的上游时,会导致星光泄漏,从而减小了仪器的动态范围。以前已经通过在日冕仪焦平面之前或附近检测星光来掩盖日冕仪,从而解决了这个问题。一种这样的解决方案,电晕低阶波前传感器(CLOWFS)使用部分反射焦平面掩模来测量Lyot型电晕仪的指向误差。为了处理没有反射焦平面掩膜的低内工作角相位掩膜电晕仪中的指向误差,我们采用了CLOWFS技术。这个新概念依赖于由焦平面相位掩模衍射的星光,该星光被Lyot光阑反射向传感器,该传感器可靠地测量低阶像差,例如倾斜和倾斜。这种基于反射型Lyyot的波前传感器是一种线性重构器,可通过相位掩模冠状图提供高灵敏度的倾斜误差测量。仿真表明,具有逼真的后自适应光学残差的指向误差的测量精度约为。对于四象限相位掩模,每个模式的10 ^ -2 lambda / D atlambda = 1.6微米。此外,我们在实验室中证明了四象限相位掩模在638 nm处开环测量的指向精度为10 ^ -2 lambda / D。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号