BTA 6米望远镜的EMCCD散斑干涉仪:描述和初步结果
The EMCCD-Based Speckle Interferometer of the BTA 6-m Telescope: Description and First Results
摘要:
本文介绍了南非天文台天文台BTA 6米望远镜的散斑干涉仪,它是以电子倍增CCD为新探测器的。仪器的主要部件是显微镜物镜、干涉滤光片和大气色散校正棱镜。PhotonMAX-512 B CCD相机采用背照式CCD 97,可在硬盘上每秒存储多达20张散斑图像(512 $\times$ 512 pix分辨率)。由于高量子效率(在550 nm处最大为93%)和其光学元件的高透射率,新相机可用于衍射极限(0.02 $''$)的图像重建的$15^{m}$恒星在良好的视宁度条件下。新系统的主要优点比上一代BTA散斑干涉仪检查。
英文摘要:
The description is given for the speckle interferometer of the BTA 6-m telescope of the SAO RAS based on a new detector with an electron multiplication CCD. The main components of the instrument are microscope objectives, interference filters and atmospheric dispersion correction prisms. The PhotonMAX-512B CCD camera using a back-illuminated CCD97 allows up to 20 speckle images (with 512$\times$512 pix resolution) per second storage on the hard drive. Due to high quantum efficiency (93% in the maximum at 550 nm), and high transmission of its optical elements, the new camera can be used for diffraction-limited (0.02$''$) image reconstruction of $15^{m}$ stars under good seeing conditions. The main advantages of the new system over the previous generation BTA speckle interferometer are examined.
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