CHOUGH:The CANARY-Hosted Upgrade for High-Order Adaptive Optics;

CHOUGH：CANARY 托管的高阶自适应光学升级；

• 批准号: ST/L002213/1
• 负责人: Richard Myers
• 金额: $ 40.78万
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2014
• 资助国家: 英国
• 起止时间: 2014 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FL002213%2F1
• 关键词: CHOUGH; CANARY; Hosted; Upgrade; Order

Astronomical Adaptive Optics is used to remove some of the effects of the Earth's atmosphere from observations of the sky made with optical telescopes. An example is the twinkling of the stars. Without AO, the sharpness and brightness of ground-based images is severely degraded with respect to what could be achieved by a telescope in space. The next generation of extremely large telescopes will have diameters of over 30m, compared with 8m today. They will not be able to go into space, so they basically require adaptive optics technology in order to fulfil their scientific missions.Up to now the UK has concentrated, via a key collaboration with France, on the adaptive optics technologies required to correct the images from these large telescopes over a wide range of the sky. This is important, for example, because it will enable many of the earliest and most distant galaxies to be surveyed simultaneously, so their formation can be compared with models, instead of individually. With one night of observing costing over £50000, AO will also ultimately save money as well as time and improve the quality of the data measured.Instead of moderate quality correction for many targets, we can instead concentrate on a very high degree of correction for one target in order to maximize the quality of the AO-enhanced images. This is called High-Order Adaptive Optics and enables us to study small, bright objects such as stars and their shape and current state. More excitingly, it will also let us look at the regions of space close to these stars where we can see if they have faint companions such as failed stars or brown dwarfs. Even more excitingly, these circumstellar regions can hold discs of dust and gas from which planets form so we need AO to better understand this aspect of astrophysics. HOAO is very difficult because we must apply AO correction both more finely and more quickly than is currently done which is why we focus on only one target.This project will enable to the UK to participate much more fully in this area of HOAO. It will do so by allowing us to re-use an existing experiment, CANARY, by extending it with a very high resolution deformable mirror, which corrects the starlight, and new measurement cameras to drive this mirror. The mirror is already in our possession, so this project is a low-cost but high-results experiment that will prove this novel type of AO using the William Herschel Telescope on La Palma, Canary Islands. Our project is called CHOUGH, or the Canary High Order UpGrade for High-order adaptive optics and its name comes from a type of crow commonly found on La Palma. The WHT telescope is particularly important as it has a purpose built laboratory to support the testing of new ideas such as CHOUGH, and this means it is possible to show that the ideas in CHOUGH work in real-life, which we call "on sky", instead of just in computer simulations.

天文学自适应光学用于消除光学望远镜观测天空时地球大气层的一些影响。一个例子是星星的闪烁。如果没有AO，地面图像的清晰度和亮度将严重下降，而太空望远镜则无法实现。下一代超大型望远镜的直径将超过30米，而今天的直径为8米。它们无法进入太空，因此基本上需要自适应光学技术来完成其科学任务。到目前为止，英国通过与法国的关键合作，集中精力研究校正这些大型望远镜在大范围天空中拍摄的图像所需的自适应光学技术。这很重要，例如，因为它将使许多最早和最遥远的星系能够同时被观测，因此它们的形成可以与模型进行比较，而不是单独进行。由于一个晚上的观测费用超过5万英镑，AO最终还将节省金钱和时间，并提高测量数据的质量。我们可以集中精力对一个目标进行非常高程度的校正，而不是对许多目标进行中等质量的校正，以最大限度地提高AO增强图像的质量。这被称为高阶自适应光学，使我们能够研究小而明亮的物体，如恒星及其形状和当前状态。更令人兴奋的是，它还可以让我们观察这些恒星附近的太空区域，在那里我们可以看到它们是否有暗淡的同伴，如失败的恒星或褐矮星。更令人兴奋的是，这些星周区域可以容纳行星形成的尘埃和气体盘，因此我们需要AO来更好地了解天体物理学的这一方面。HOAO是非常困难的，因为我们必须比目前做的更精细和更快地应用AO校正，这就是为什么我们只关注一个目标。该项目将使英国能够更充分地参与HOAO的这一领域。它将允许我们重新使用现有的实验，CANARY，通过使用一个非常高分辨率的可变形镜来扩展它，它可以校正星光，以及新的测量相机来驱动这个镜子。镜子已经在我们手中，所以这个项目是一个低成本但高结果的实验，将使用加那利群岛拉帕尔马的威廉赫歇尔望远镜证明这种新型的AO。我们的项目被称为CHOUGH，或用于高阶自适应光学的金丝雀高阶升级，它的名字来自拉帕尔马常见的一种乌鸦。WHT望远镜特别重要，因为它有一个专门建造的实验室来支持测试新的想法，如CHOUGH，这意味着有可能证明CHOUGH中的想法在现实生活中起作用，我们称之为“天空”，而不仅仅是在计算机模拟中。

项目成果

Concept validation of a high dynamic range point-diffraction interferometer for wavefront sensing in adaptive optics

用于自适应光学波前传感的高动态范围点衍射干涉仪的概念验证

• DOI: 10.48550/arxiv.2204.04940
• 发表时间: 2022
• 作者: Dubost N

On-sky tests of the CuReD and HWR fast wavefront reconstruction algorithms with CANARY

使用 CANARY 对 CuReD 和 HWR 快速波前重建算法进行空中测试

• DOI: 10.1093/mnras/stv003
• 发表时间: 2015
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Bitenc U

Concept validation of a high dynamic range point-diffraction interferometer for wavefront sensing in adaptive optics.

用于自适应光学中波前传感的高动态范围点衍射干涉仪的概念验证。

• DOI: 10.1364/ao.439569
• 发表时间: 2022
• 期刊: Applied optics
• 影响因子: 1.9
• 作者: Dubost N

Estimating stochastic noise using in situ measurements from a linear wavefront slope sensor.

使用线性波前斜率传感器的原位测量来估计随机噪声。

• DOI: 10.1364/ol.41.000428
• 发表时间: 2016
• 期刊: Optics letters
• 影响因子: 3.6
• 作者: Bharmal NA

CHOUGH: current status and future plans

CHOUGH：现状和未来计划

• DOI: 10.1117/12.2313172
• 发表时间: 2018
• 作者: Henry D