聚合物泡沫结构及密度分布的相衬CT表征技术

Characterization of microstructure and density of polymer foam with X-ray phase contrast computed tomography

阐述了利用X射线相衬成像技术研究高分子有机泡沫材料微观结构的原理及方法,理论分析及实验结果表明,X射线相衬成像方法可以在相当大的程度上提高低Z聚合物泡沫材料的成像衬度。将相衬成像技术与计算机层析成像技术相结合,获得了泡沫样品的3维骨架结构分布,同时,提出利用统计切片骨架"粒子"质心分布的方法来表征其密度分布均匀性。结果说明,该方法能够在微观层次上实现对泡沫样品3维密度分布的完备表征。

This paper analyzes the principle and method of X-ray phase contrast imaging technique used to characterize the microstructure of polymer foam.The analytical result shows that the image contrast of low Z polymer foam can be considerably improved with X-ray phase contrast tomography.The three dimensional microstructure of polymer foam is observing combined phase contrast tomography with computed tomography,and the characterization method of foam density distribution is introduced by calculating the centroid of framework ＂particle＂.The experimental result indicates that,the three dimensional density distribution of foams can be completely characterized through phase contrast computed tomography technique and the statistical method of framework ＂particle＂ centroid.