基于超声相控阵技术的内壁腐蚀管道三维模型重构

Three-dimensional model reconstruction of pipeline with inner wall corrosion based on ultrasonic phased array technology

管道内壁腐蚀存在隐蔽性强、不易及时监测等问题,为了直观展现内腐蚀管道形貌、缺陷的体积及空间分布情况,提出了基于超声相控阵技术的内壁腐蚀管道三维模型重构方法。采用自主搭建的采集平台,通过控制相控阵一维线阵探头,利用反射后的回波信号获取腐蚀管道内、外径空间坐标,再利用插值法构建内、外径间的点云数据集,并使用分层扫描方式得到各断层的点云数据;采用数据处理、逆向模型重构及正向建模等方式,对所采集的点云数据进行三维模型重构。将重构的三维模型与Creaform三维激光扫描仪获取的点云数据进行对比,结果表明:基于超声相控阵技术利用一维线阵探头获取点云数据具有可行性,且所建三维模型及缺陷的误差小、精准化程度高,对油气管道安全评估具有重要的参考价值。

The inner wall corrosion of pipelines is concealed and hard to monitor in time.In order to visualize the shape of the internally corroded pipeline,as well as the defect volume and its spatial distribution,a three-dimensional(3D)model reconstruction method based on the ultrasonic phased array technology was proposed for the internally corroded pipeline.A self-built acquisition platform was used to control the one-dimensional linear array probes for the phased array,and the reflected echo signal was used to obtain the space coordinates between the inner and outer diameters of the corroded pipeline.Then,the point cloud data set between the inner and outer diameters was constructed by the interpolation method,and the point cloud data of each fracture zone were obtained by the hierarchical scanning method.Besides,data processing,reverse model reconstruction and forward modeling were performed for the 3D model reconstruction of the collected point cloud data.Finally,the reconstructed 3D model was compared with the point cloud data obtained by the Creaform 3D laser scanner.The results show that it is feasible to obtain the point cloud data using one-dimensional linear array probes based on the ultrasonic phased array technology,and the established 3D model and defects have small errors and high precision,which has important reference value for the safety evaluation of oil and gas pipelines.(8 Figures,3 Tables,22 References)