DIMM with large aperture separation and simultaneous seeing measurements at Mauna Kea
DIMM with large aperture separation and simultaneous seeing measurements at Mauna Kea
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具有大孔径间隔和莫纳克亚山同步视宁度测量的 DIMM
DOI：
10.1117/12.458226
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
N. Okada
中科院分区：
文献类型：
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作者：
F. Uraguchi;N. Takato;A. Miyashita;K. Yanagisawa;N. Okada
我们开发了两个dimm（差分图像运动监视器），用于在多个地点同时看到测量。同时视觉测量使我们能够区分时间变化和不同地点的视觉变化，并澄清哪个地点的视觉更好。我们将DIMM的孔径间距设置为50 cm，以便在莫纳克亚山良好（~0.3弧秒）的观测条件下进行精确测量。我们的系统还可以通过改变光学元件的有效焦距来调整中等到不良的视觉条件。我们的DIMM器件的框架采用CFRP制成，以避免随着温度变化而变形，并减轻其重量。我们将介绍DIMM系统的细节以及在夏威夷莫纳克亚山同时观测的一些结果。
We developed two DIMMs (Differential Image Motion Monitor) for simultaneous seeing measurements at multiple sites. Simultaneous seeing measurements enable us to distinguish temporal variation and site to site variation of seeing, and clarify which site has better seeing. We set the aperture separation of the DIMM at 50 cm for accurate measurements under good (~0.3 arcsec) seeing conditions for Mauna Kea. Our system can also be tuned for moderate to bad seeing conditions by changing the effective focal length of the optics. The frame of our DIMM device is made of CFRP in order to avoid deformation with temperature change and to reduce its weight. We will present the details of our DIMM system and some results of simultaneous seeing measurements at Mauna Kea, Hawaii.