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Chromospheric telescope of Baikal Astrophysical Observatory. New light

机译：贝加尔湖天文台的望远镜。新光

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摘要

A chromospheric telescope is an important instrument for synoptic observations and solar research. After several decades of observations with the chromospheric telescope at the Baikal Astrophysical Observatory, a need arose to improve the characteristics of this telescope and filter. A new reimaging lens to produce full-disk solar images 18 mm in diameter at the CCD camera Hamamatsu C-124 with a 36×24 mm detector (4000×2672 pixels) was designed and manufactured to replace the out-of-operation 50×50 mm Princeton Instruments camera. A contrast interference blocking filter and new calcite and quartz crystal plates were made and installed instead of damaged ones in the Hα birefringent filter (BF), manufactured by Bernhard Hallе Nachfl. The optical immersion in the filter was changed. All telescope optics was cleaned and adjusted. We describe for the first time the design features and their related BF passband tuning. The wavefront interferograms of optical elements and telescope as a whole show that the wavefront distortion of the optical path is within 0.25 λ. The BF and prefilter spectral parameters provide high-contrast monochromatic images. Besides, we give examples of solar chromospheric images in the Hα line core and wing.
机译：色球望远镜是天气观测和太阳研究的重要工具。在贝加尔天体天文台用色球望远镜进行了几十年的观测之后，出现了改善这种望远镜和滤光镜特性的需求。设计并制造了一种新的再成像镜头，用于在CCD相机Hamamatsu C-124上使用36×24 mm检测器（4000×2672像素）产生直径为18 mm的全盘太阳图像，以替代无法使用的50× 50毫米Princeton Instruments相机。在由BernhardHalléNachfl制造的Hα双折射滤光片（BF）中，制造并安装了对比干涉阻挡滤光片以及新的方解石和石英晶体板，而不是损坏的滤光片。改变滤光片的光学浸没。所有望远镜的光学元件均已清洗和调整。我们首次描述了设计功能及其相关的BF通带调整。光学元件和望远镜整体的波前干涉图表明，光路的波前畸变在0.25λ之内。 BF和预滤器光谱参数可提供高对比度的单色图像。此外，我们还给出了Hα线核心和机翼上太阳色球图像的示例。

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