Brinkman A C, Dijkstra J H, Geerlings W F, van Rooijen F A, Timmerman C, de Korte P A
Appl Opt. 1980 May 15;19(10):1601-5. doi: 10.1364/AO.19.001601.
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.
本文报告了将搭载于欧洲X射线天文台卫星（EXOSAT）上的X射线透射光栅的效率和分辨率测量结果。通过优化光栅条的厚度，可在有限的能量范围内获得非常高的效率。在7.1埃时绝对效率达到20%，在15埃以上降至10%，这包括了支撑结构和为通过空间环境鉴定所需的安装的所有影响。这意味着在7.1埃时，10%的入射辐射产生负一级光谱，10%产生正一级光谱。在该范围的短波长端（λ>20埃）测量的分辨率由镜面分辨率决定；在较长波长（300埃）时，彗差和像散的影响占主导。EXOSAT镜面 - 光栅系统在304埃处测量的分辨率为4.5埃，与理论预测相符。
