工业CT材料密度测量方法研究

为了实现对密度高且变化范围大的材料进行密度定量测量，建立自动密度测量系统，对工业材料的密度与CT数的关系进行研究。根据工业CT检测工件常见密度，选取有代表性的几种均匀材料作为标件，并以铝材料作为参考标准件。通过CT扫描获取不同密度标件对应的CT数。选用一幅CT图像为标定图像，以该图像中空气的CT数为标准，对被测材料的CT数进行修正。采用最小二乘法拟合材料密度与CT数的关系式。实验对塑料、橡胶、玻璃、钛合金、钢、铜等材料的密度进行测试，测量精度小于1%。测量结果基本满足工业材料密度的精度要求。

Research on measuring ICT material density

In order to realize density quantitative measurement for high-density and great varying range materials,an automatic density measurement system is established and the relationship between the density and CT number of industrial materials is in-vestigated.According to the common density of detected work-piece in ICT,a few representative kinds of uniform material are chosen as the standard work-pieces and aluminum material is as a standard reference.It is based on CT scanning to gain the CT number with differ...