Effect of telescope vibrations upon high angular resolution imaging
Effect of telescope vibrations upon high angular resolution imaging
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DOI：
10.1046/j.1365-8711.2001.04111.x
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发表时间：
2001-03-01
影响因子：
4.8
通讯作者：
Fuensalida, JJ
中科院分区：
文献类型：
--
作者：
Altarac, S;Berlioz-Arthaud, P;Fuensalida, JJ
我们分析了短曝光高分辨率图像上获得的威廉赫歇尔望远镜（WHT），大望远镜方位角（BTA）和加拿大-法国-夏威夷望远镜（CFHT），以调查机械振动，能够降低高角分辨率允许的斑点干涉方法。在滤除光子噪声后，我们计算了图像重心的功率谱。在这些光谱中，我们发现了不同望远镜的振动特征，特别是随着天顶角的变化而变化。在WHT的情况下，我们讨论这些结果的可能原因和传递函数的退化。我们提出了一些改进数据的方法。
We have analysed short-exposure high-resolution images obtained on the William Herschel Telescope (WHT), Big Telescope Azimuthal (BTA) and Canada-France-Hawaii Telescope (CFHT) in order to investigate mechanical vibrations that are capable of reducing the high angular resolution allowed by speckle-interferometric methods. After filtering the photon noise we have computed power spectra of the image centres of gravity. In these spectra we have found vibration features that differ from one telescope to another and that vary in particular with the zenith angle. In the case of the WHT we discuss these results in terms of possible causes and in terms of degradation of the transfer function. We present some means to improve the data.