Cheng Jinming, Qi Shuangxi, Liu Dongbing, Qian Weixin, Zhang Lin, Li Yinghua, Ye Yan
Appl Opt. 2022 Apr 20;61(12):3480-3485. doi: 10.1364/AO.453507.
X-ray backlighting is been widely used today in dynamic phenomena observation. By applying proper synchronizing techniques, the in-situ data of the intensity distribution of the fragments in laser-driven shock-loaded aluminum were obtained for a particular moment using x-ray backlighting imaging. The image resolution was better than 40 µm in this context by introducing a pinhole. In order to obtain the areal mass of the fragments, a set of reference Al step wedges with certain thicknesses was employed. Furthermore, a novel, to the best of our knowledge, calibration method is introduced to calibrate the x-ray intensity distribution. It was effective to decrease the non-uniformity influence of the x-ray intensity with this calibration method by simulating a light field. After calibration, the standard deviation of 30 regions of interest reduced to 4.17%. In consequence, the areal mass distribution of the fragments is well quantified. It should be noted that the uncertainty in the areal mass conversion mainly comes from the non-uniformity of the x-ray intensity distribution with about 5% and the measurement uncertainty of the step thicknesses with less than 10%.
如今，X射线背光照相技术在动态现象观测中得到了广泛应用。通过应用适当的同步技术，利用X射线背光照相成像在特定时刻获取了激光驱动冲击加载铝片中碎片强度分布的原位数据。在此情况下，通过引入针孔，图像分辨率优于40微米。为了获得碎片的面质量，使用了一组具有一定厚度的参考铝阶梯楔块。此外，据我们所知，引入了一种新颖的校准方法来校准X射线强度分布。通过模拟光场，这种校准方法有效地降低了X射线强度的不均匀性影响。校准后，30个感兴趣区域的标准偏差降至4.17%。因此，碎片的面质量分布得到了很好的量化。需要注意的是，面质量转换的不确定性主要来自于X射线强度分布的不均匀性，约为5%，以及阶梯厚度的测量不确定性，小于10%。
