光学
栅栏
光谱分辨率
物理
X射线光学
波长
分辨率(逻辑)
辐射
衍射光栅
X射线望远镜
彗差(光学)
天文台
衍射效率
望远镜
材料科学
X射线
谱线
天体物理学
天文
人工智能
计算机科学
作者
A. C. Brinkman,J. H. Dijkstra,W. F. P. A. L. Geerlings,F. A. van Rooijen,C. Timmerman,P. A. J. de Korte
出处
期刊:Applied optics
[The Optical Society]
日期:1980-05-15
卷期号:19 (10): 1601-1601
被引量:24
摘要
Efficiency and resolution measurements are reported of an x-ray transmission grating to be flown on board the European X-ray Observatory Satellite (EXOSAT). By optimizing the thickness of the grating bars, very high efficiencies can be obtained over a limited energy range. An absolute efficiency of 20% at 7.1 A decreasing to 10% above 15 A has been achieved, including all effects of support structure and mounting necessary to withstand space qualification. This means that 10% of the incoming radiation at 7.1 A results in the minus first spectral order and 10% in the plus first order. The measured resolution at the short wavelength end of the range (lambda > 20 A) is determined by the mirror resolution; at the longer wavelengths (300 A), the effects of coma and astigmatism dominate. The measured resolution at 304 A for the EXOSAT-mirror-grating system is 4.5 A in agreement with theoretical predictions.
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