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高乾祥,等:

              PE 管道外壁缺陷的微波可视化定量检测

                                                                平面尺寸。
                                                                     评估结果显示减薄缺陷定位误差在 0. 5 mm以
                                                                内,面积评估精度可达 90% 以上;裂纹定位误差
                                                                在 1 mm 以内,长度评估精度可达 88% 以上,实现
                                                                了较高精度的缺陷可视化定量评估。文章所提方

                      图 11  裂纹缺陷的二值化分割处理结果                      法可对工程实际中PE管道的外壁减薄及裂纹缺陷
              插值处理,最后使用阈值分割二值化和Regionprops                      进行可视化定位和平面尺寸评估,具有工程应用
              统计函数定量评估了管道外壁缺陷中心位置与                              价值。
                                                表3  裂纹定位及长度评估结果
                   缺陷编号          评估位置/mm         实际位置/mm         评估长度/mm          实际长度/mm         长度误差/%
                     #2           (51.7, 13.1)    (52.0,13.0)        31.5             30              5
                     #3           (22.3, 12.9)    (22.0,13.0)        27.5             30              8.3
                     #4           (82.1, 23.7)    (82.0,23.0)        32               30              6.7
                     #5           (51.8, 22.8)    (52.0,23.0)        33.5             30             11.7
                     #6           (21.8, 22.4)    (22.0,23.0)        33               30             10
                     #7           (82.0, 33.3)    (82.0,33.0)        33.5             30             11.7
                     #8           (52.1, 32.0)    (52.0,33.0)        33.5             30             11.7
                     #9           (22.0, 32.3)    (22.0,33.0)        33.5             30             11.7
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                                                                                         2024 年 第 46 卷 第 10 期
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