Development of a device for measuring turbulence in the air above telescopes that observe the sun

开发用于测量观测太阳的望远镜上方空气湍流的装置

• 批准号: 1607921
• 负责人: Deqing Ren
• 金额: $ 39.34万
• 依托单位: The University Corporation, Northridge
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1607921&HistoricalAwards=false
• 关键词: Development; device; measuring; turbulence; air

Measuring the turbulence in the atmosphere at different altitudes or "heights" above telescope observing sites allows astronomers to correct for the blurring of images that this turbulence produces. This blurring occurs when observing stars and galaxies at night, but also when observing the star nearest to the earth, the Sun, during the day. The principal investigator (PI) of this proposal, along with a graduate student and a post-doctoral scholar, will build a portable unit that can be used to measure the turbulence "profile" above any observatory. The instrument will be used specifically with telescopes that observe the sun. The device will be tested at solar telescopes at the Sacramento Peak and Kitt Peak observatories, and eventually at the U.S.'s newest facility, the Daniel K. Inouye Solar Telescope, DKIST, in Hawaii. The PI's institution, California State University Northridge (CSUN), is an undergraduate teaching institution with modest internal support for research; it is also a Hispanic Serving Institution (HSI) due to the large fraction of under-represented minority undergraduates served.The PI aims to develop a portable seeing profiler for use at solar observatories. The device will measure the profile of atmospheric turbulence as a function of altitude (up to 30 km) above the observing site. The instrument comprises off-the-shelf components and two small, 10 cm telescopes that can be transported to any solar observatory. Knowledge of the atmospheric seeing conditions is crucial to the performance of solar adaptive optics (AO) systems. Existing seeing profiler techniques use large telescopes with diameters of 1.2 meters or more and need access to the sky over many months. The low-cost portable system proposed here should thus alleviate some of these issue. Currently, relatively little is known about the daytime seeing profile on many of the world's solar telescope sites. A prototype device has already been built and tested; for the new instrument modest funding is requested to purchase mechanical parts and two scientific CMOS cameras, to assemble the equipment, to develop the associated software, and finally to test the set-up at Sacramento Peak and at the DKIST site in Hawaii.

在望远镜观测点上方的不同高度或“高度”测量大气中的湍流，使天文学家能够校正这种湍流产生的图像模糊。这种模糊现象在夜间观测恒星和星系时会出现，在白天观测距离地球最近的恒星太阳时也会出现。这项计划的首席研究员(PI)将与一名研究生和一名博士后学者一起建造一个便携式装置，可以用来测量任何天文台上方的湍流“轮廓”。该仪器将专门与观测太阳的望远镜一起使用。该装置将在萨克拉门托峰和基特峰天文台的太阳望远镜上进行测试，最终将在美国S最新的设施--位于夏威夷的丹尼尔·K·井上太阳望远镜--进行测试。PI的机构，加利福尼亚州立大学北岭分校(CSUN)，是一个本科教学机构，内部对研究提供适度的支持；它也是一个西班牙裔服务机构(HSI)，因为大部分代表不足的少数族裔本科生得到了服务。PI的目标是开发一种便携式观测仪，用于太阳天文台。该装置将测量大气湍流的轮廓，作为观测点上方海拔(最高可达30公里)的函数。该仪器包括现成的部件和两个10厘米的小望远镜，可以运送到任何太阳天文台。大气视场条件的了解对太阳自适应光学系统的性能至关重要。现有的视景剖面仪技术使用直径1.2米或更大的大型望远镜，需要数月才能进入天空。因此，这里提出的低成本便携式系统应该会缓解一些这些问题。目前，人们对世界上许多太阳望远镜站点的白天观测轮廓知之甚少。已经建造并测试了一个原型装置；对于新仪器，需要适度的资金来购买机械部件和两个科学的cmos相机，组装设备，开发相关软件，最后在萨克拉门托山顶和夏威夷的DKIST现场测试设置。

项目成果

Global optimization-based reference star differential imaging for high-contrast exoplanet imaging survey

• DOI: 10.1093/mnras/stab022
• 发表时间: 2021-02
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: D. Ren;Yili Chen