x射线凸度检测中探测技术与横断面轮廓重建研究

项目名称： x射线凸度检测中探测技术与横断面轮廓重建研究

项目编号： No.10875068

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 吴志芳

作者单位： 清华大学

项目金额： 32万元

中文摘要： 我国钢铁年产量已超过6亿吨，多年来稳居世界第一，在经济发展与国防建设中发挥了重大作用，也是出口创汇大户。然而，虽然总量巨大，我国距离"钢铁强国"还有一定差距。主要差距之一就是板带材生产中的高端在线检测装备（如用于板型与厚度控制的"凸度仪"）仍然完全被国外少数公司所垄断。2008年1月，国家发改委发布了专项规划，以期促进此方面的工作。 本课题提出"双源-双阵列气体电离室"凸度测量技术方案，建立了凸度测量的物理数学模型，通过理论分析与仿真，研究了断面轮廓重建模型、x光机参数及系统结构参数等因素对测量精度的影响机理，研制了专用阵列充气电离室、数据测量与轮廓重建的核心算法（包括断面轮廓重建算法、系统刻度流程与算法、合金补偿算法、温度校正算法、散射校正算法等）。在此基础上，建立了凸度检测试验平台，开发相关软件实现各种核心算法，并进行了系列试验验证。目前在试验平台上可以实现100断面/s的测量速度，测量精度可达到±0.1%，能满足工业现场对凸度检测的要求。 本课题研究，奠定了凸度检测技术自主创新的基础，已获得了北京市科委资资助（850万元），启动了凸度检测系统样机研制与产业化工作。

中文关键词： 凸度；凸度检测；X射线；横断面轮廓重建

英文摘要： With a domestic annual output of iron and steel over 600 million tons, iron and steel production of China holds the first place firmly in the world, and plays an important role in economy development and defense construction with a tremendous amount of export revenues. However, despite of the large amount of overall production, China is not a country with powerful iron yet. The main gap is that the high-level online measuring equipment in strip production (such as the "instantaneous profile gauge" for plate shape and thickness control) is still monopolized by foreign companies so far. In January 2008, the National Development and Reform Commission releases a special planning so as to promote the development in this aspect. The present project proposes a technical scheme of "dual X-ray + gas ionization chamber array", physical and mathematic model of crown measuring is established, by theoretical analysis and simulation, the mechanism of how cross-section profile reconstruction model, x-ray machine parameters and structure parameters effect the measuring precision is researched, and the project has developed a special gas-filled ionization chamber, finished the core algorithm of system measurement and profile reconstruction (including cross-section profile reconstruction algorithm, system calibration procedure and algorithm, alloy compensation algorithm, temperature correction algorithm, scatter correction algorithm and so on). On the basis of the above research, a crown measurement experiment platform is established, related software is developed to realize various core algorithms, and a series of experiments are performed. Measuring velocity of the system on this experiment platform can reach 10ms per section and measuring precision can reach ±0.1%, which meets the crown measurement requirement at a industrial site. Research of the present project lays a foundation for independent research upon crown measuring technology, and this project has gained financial support from Beijing Municipal Science & Technology Commission, and work upon developing a crown measuring system prototype and industrialization has been well started.

英文关键词： Crown；Profile Gauge；X-ray；Cross-section Reconstruction