Small-Angle X-ray Scattering Measurements and Image Reconstruction by the Maximum Entropy Method
Small-Angle X-ray Scattering Measurements and Image Reconstruction by the Maximum Entropy Method
复制标题
最大熵法小角X射线散射测量和图像重建
DOI：
10.1021/ac9604301
复制
发表时间：
1997
影响因子：
7.4
通讯作者：
Katsunari Sasaki
中科院分区：
文献类型：
--
作者：
Yuji Sasanuma;R. V. Law;Yuji Kobayashi;Katsunari Sasaki
为了在实验室中进行快速小角X射线散射（SAXS）测量，我们设计并组装了一个SAXS测量系统，该系统包括一个新的点聚焦相机，该相机使用W/Si多层膜的双弯曲单色器。作为二维探测器和X射线源，使用成像板（IP）和在40 kV和30 mA下操作的微焦点为0.1 × 0.1 mm 2的双阳极发生器。作为时间分辨小角X射线散射测量的一个例子，本文报道了热致液晶4-[（2 ′-甲基丁基）苯基]-4 ′-正辛基联苯-4-羧酸酯的近晶A → B转变的观测结果。为了校正由于光束发散而导致的展宽并提高数据的信噪比，采用了基于最大熵方法（MaxEnt）的二维反卷积。单轴延伸的高密度聚乙烯薄膜的SAXS图像重建从噪声数据获得的X射线曝光仅3秒。反卷积被证明给定量…
For rapid small-angle X-ray scattering (SAXS) measurements in laboratories, we have designed and assembled a SAXS measurement system, which includes a new point-focusing camera using a doubly curved monochromator of a W/Si multilayer. As the two-dimensional detector and the X-ray source, an imaging plate (IP) and a rotating-anode generator operated at 40 kV and 30 mA with a microfocus of 0.1 × 0.1 mm2 are used. As an example of time-resolved SAXS measurements with our system, an observation of smectic A-nematic transition of a thermotropic liquid crystal 4-[(2‘-methylbutyl)phenyl]-4‘-n-octylbiphenyl-4-carboxylate is reported. To correct the broadening due to the beam divergence and enhance the signal-to-noise ratio of the data, two-dimensional deconvolution based on the maximum entropy method (MaxEnt) has been employed. A SAXS image of a uniaxially extended high-density polyethylene film was reconstructed from noisy data obtained by an X-ray exposure of only 3 s. The deconvolution was shown to give quanti...