• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Advancements in Adaptive Optics pt.1 >OPERA, an automatic PSF reconstruction software for Shack-Hartmann AO systems: application to Altair
【24h】

OPERA, an automatic PSF reconstruction software for Shack-Hartmann AO systems: application to Altair

机译：OPERA，Shack-Hartmann AO系统的自动PSF重建软件：应用于Altair

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

When doing high angular resolution imaging with adaptive optics (AO), it is of crucial importance to have an accurate knowledge of the point spread function associated with each observation. Applications are numerous: image contrast enhancement by deconvolution, improved photometry and astrometry, as well as real time AO performance evaluation. In this paper, we present our work on automatic PSF reconstruction based on control loop data, acquired simultaneously with the observation. This problem has already been solved for curvature AO systems. To adapt this method to another type of WFS, a specific analytical noise propagation model must be established. For the Shack-Hartmann WFS, we are able to derive a very accurate estimate of the noise on each slope measurement, based on the covariances of the WFS CCD pixel values in the corresponding sub-aperture. These covariances can be either derived off-line from telemetry data, or calculated by the AO computer during the acquisition. We present improved methods to determine 1) r_0 from the DM drive commands, which includes an estimation of the outer scale L_0; 2) the contribution of the high spatial frequency component of the turbulent phase, which is not corrected by the AO system and is scaled by r0. This new method has been implemented in an IDL-based software called OPERA (Performance of Adaptive Optics). We have tested OPERA on Altair, the recently commissioned Gemini-North AO system, and present our preliminary results. We also summarize the AO data required to run OPERA on any other AO system.
机译：使用自适应光学系统（AO）进行高角度分辨率成像时，至关重要的是准确了解与每个观测值相关的点扩展函数。应用广泛：通过反卷积增强图像对比度，改进的光度法和天体测量法以及实时AO性能评估。在本文中，我们介绍了基于控制回路数据（与观测同时获得）的自动PSF重建的工作。对于曲率AO系统已经解决了这个问题。为了使这种方法适应另一种WFS，必须建立一个特定的分析噪声传播模型。对于Shack-Hartmann WFS，我们能够基于相应子孔径中WFS CCD像素值的协方差，在每次斜率测量中得出非常准确的噪声估计。这些协方差可以从遥测数据离线获取，也可以在采集过程中由AO计算机计算。我们提出了改进的方法来确定1）DM驱动命令中的r_0，其中包括外部比例尺L_0的估计； 2）湍流相的高空间频率分量的贡献，它没有被AO系统校正，而是由r0缩放。这种新方法已在基于IDL的称为OPERA（自适应光学性能）的软件中实现。我们已经在最近投入使用的Gemini-North AO系统Altair上测试了OPERA，并提供了初步结果。我们还总结了在任何其他AO系统上运行OPERA所需的AO数据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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