压力容器标准椭圆封头拼接焊缝射线探伤工艺的改进措施

为了满足生产需要对椭圆封头拼接焊缝射线探伤工艺进行改进。并取得了满意效果。     

Explicit geometric model of a radioscopic imaging system

In this paper a new explicit model of a radioscopic imaging system is presented. The model includes three parts: X-ray projection, image intensifier and CCD camera. The X-ray projection is modelled as a linear central projection. The image intensifier is modelled using a new explicit model that considers the curved input screen and the non-linear projection caused by electromagnetic fields. The CCD camera is modelled according to a general 2D projective transformation of the output screen of the image intensifier. Thus, the back-projection, required for 3D reconstruction, can be expressed in a closed-form. The model is compared to seven other known models. The presented model achieves high accuracy.     

新型双丝像质计设计

从射线检测的一般理论,提出了新型双丝像质计设计的理论.试验证明,所提出的理论可以用于指导新型双丝像质计的设计.该像质计可克服标准型双丝像质计只能得到一些特定的不清晰度值问题,并可测量更大范围的不清晰度.     

射线检测在复合材料无损检测中的应用

随着新型复合材料的迅速开发和应用，其制造过程监测、产品缺陷检测及质量评价等已成为不可缺少的环节。射线检测技术在复合材料无损评价中占有极其重要的地位。对现有的主要射线检测方法，包括X射线照相法、X射线实时成像法、射线计算机断层扫描法、射线断层形貌成像法、康普顿散射法及中子照相法等在复合材料质量评价中的应用状况进行了简要的评述，并指出复合材料射线检测的发展趋势。     

射线实时成像检验技术与射线照相检验技术的等价性讨论

在分析射线照相检验技术的有关规定的基础上，提出了射线实时成像检验技术在与射线照相检验技术具有同等缺陷检验能力情况下的等价性指标。对射线实时成像检验技术的应用具有重要意义。     

Complementarity of a photon-counting system and radioscopy for inspection of cast aluminium components

This study aims at establishing X-ray methods for inspection of cast aluminium components by combining two approaches, a radioscopic inspection, and a photon-counting system.Indeed, radioscopy is widely used in castings inspection for automatic defect detection and is an efficient method for characterising rather small thicknesses, typically less than 40 mm. However, cast components often show a high range of thicknesses and imaging the whole range is difficult. We propose to use photon-counting measurements to complement the radioscopic image for high thicknesses. Photon-counting is not an imaging tool, but the thickness sensitivity obtained from photon-counting measurements (number of X-ray photons transmitted through the object) is much better than what can be obtained by classical radioscopy for up to 60 mm of aluminium. For high thicknesses of aluminium, within small volumes where defects are believed to be critical, the photon-counting system allows getting information additional to that obtained from classical radioscopy images.     

微焦点X射线实时成像的图像采集与处理

本文主要介绍微焦点X射线实时成像检测的基本原理,图像质量分析及图像采集与图像处理技术。     

薄壁圆环激光焊缝X射线实时成像检测应用

利用射线照相的替代技术——X射线实时成像检测技术，对某薄壁圆环的焊缝进行了实时成像检测，结果表明该技术可以检测出试环焊缝中最小为0．4mm的孔型缺陷，像质计测定的检测灵敏度优于2％。