Digital radiography inspection of corrosion depth of pressure pipeline
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摘要: 采用数字射线成像检测技术对压力管道进行定期腐蚀检验和腐蚀深度测量。检测试验过程中使用了不同工艺参数的透照阶梯试块，考虑到采集到图像的灰度值与透照厚度的关系近似于指数曲线，采用数字射线成像检测测量管道腐蚀位置附近的已知厚度点的灰度，把腐蚀位置的灰度代入指数函数后通过两点拟合指数曲线，计算出腐蚀深度，并进行试验验证。结果表明，计算结果与实测结果误差很小，该结果可为相关研究及工程应用提供参考。Abstract: Using digital radiography inspection technology to conduct regular corrosion inspection and corrosion depth measurement on pressure pipelines. Different process parameters are used in the process of the inspection test. Taking into account that the relationship between the gray value of the collected image and the thickness of the transillumination is similar to an exponential curve, digital radiography is used to detect the gray level of the point of the known thickness near the corrosion position of the measurement pipeline. Through two-point fitting exponential curve, after substituting the gray value of the corrosion position into the exponential function, the corrosion depth is calculated, and the test is verified. The result shows that the error between the calculated value and the measured value is very small, and the result provides reference for research and engineering applications.
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Keywords:
- corrosion depth /
- gray /
- transillumination thickness /
- linear relationship /
- defect height
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[1] 郭文明, 陈宇亮.X射线图像灰度值与透照厚度的定量关系[J].无损检测,2016,38(2):14-17. [2] 巩德兴, 姚力,陈晓辉,等.X射线数字成像在压力管道检测中的应用[J].无损检测,2017,39(11):27-30. [3] 陈乐, 强天鹏,盛佩军,等.管电压对射线数字成像检测成像质量的影响[J].无损检测,2020,42(2):12-16.
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