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• 庆祝湖北省工程图学学会成立50周年专栏 • 上一篇    下一篇

储罐底板漏磁检测缺陷整体分布图自动生成方法

  

  • 出版日期:2013-10-31 发布日期:2015-06-19

An Auto-generating Method of Defect Distribution Mapping for Tank Floor Inspection Based on Magnetic Flux Leakage

  • Online:2013-10-31 Published:2015-06-19

摘要: 针对现有检测系统需要借助CAD 商业软件和人工标识相结合,才能绘制
储罐底板缺陷分布图的不足,研究了基于漏磁检测技术的储罐底板缺陷整体分布图自动生成
方法。首先,选择漏磁探头首通道传感器的扫查起始位置为基点,通过传感器通道数和采样
间隔定义单次扫查区域;然后,根据缺陷信号所跨越的传感器通道数以及起、止采样点数,
计算出矩形框对角线上两个顶点的坐标,并依此绘制矩形框以表征缺陷大小,进而得到单次
扫查缺陷分布图;再在统一的坐标系下,对单次扫查缺陷分布图进行归一化处理,并对相邻
两次扫查检测到的同一缺陷进行合并运算;最后,通过多次扫查图拼接,得到储罐底板缺陷
的整体分布图。检测试验证明,该方法能实现储罐底板缺陷整体分布图的直观显示,自动生
成可视化缺陷检测报告,提高了储罐底板漏磁检测系统的检测效率、实用性和可靠性。

关键词: 储罐底板, 缺陷分布图, 坐标归一化, 漏磁

Abstract: In order to solve the problem in defect distribution mapping for the current tank
floor testing system, a method is developed based on the magnetic flux leakage (MFL) technique for
generating defect distribution maps automatically for floor inspection. Firstly, the initial scanning
position of the first channel sensor in MFL detector is chosen as reference point, and the single
scanning region can be defined by sensor channel numbers and sampling interval; then the vertex
coordinates of rectangle block diagonal are calculated by the sensor channels and sampling points of
defect signals involved, a block can be drawn to characterize the defect and the single defect
distribution map is generated. And after the reference point coordinates are normalized under an
unified coordinate system, blocks characterized the same defect, which are drawn in two adjacent
scanning, are merged into a new one by combing operation. Finally, the map to show defects
distributed on the whole tank floor are joined by single defect distribution maps. The experimental
results indicate that the proposed methods can generate the defect distribution map of tank floor
automatically, provide defect reports for tank floor inspection intuitively, and improve the efficiency,
practicality and reliability of the tank floor inspection system.

Key words: tank floor, defect distribution map, coordinates normalized, magnetic flux
leakage