作者：佟宇1, 张东利2, 姜禄1, 王闯龙1
作者单位：1. 北方民族大学电气信息工程学院，宁夏 银川 750021;
2. 北方民族大学机电工程学院，宁夏 银川 750021
关键词：电磁无损检测;电涡流传感器;涡流测距;曲面试件
摘要：
为提高曲面试件的涡流测距精度，提出一种基于涡流信号差值的测距修正方法。该方法通过研究不锈钢平板试件与曲面试件涡流信号的不同，拟合计算出曲面涡流信号和平面涡流信号之间差值与曲面试件曲率的定量关系。利用这一函数关系，对不同曲率试件的测量结果进行补偿，可修正由于试件存在曲面造成的测量误差。通过实验进行可行性验证，对平板试件与不同直径轴件的测距结果进行误差分析。结果表明：相比于直接进行曲面涡流测距的传统手段，该方法将曲面试件测距误差降低60%以上，显著提高曲面测距精度，可应用于金属曲面涡流测距。
Research on measurement method of metal surface distance based on eddy current test signal
TONG Yu1, ZHANG Dongli2, JIANG Lu1, WANG Chuanglong1
1. School of Electrical and Information Engineering, North Minzu University, Yinchuan 750021, China;
2. School of Mechanical and Electrical Engineering, North Minzu University, Yinchuan 750021, China
Abstract: In order to improve the accuracy of eddy current measuring of curved specimens, a method based on the subtraction of eddy current signals to correct the distance measurement results is proposed. By studying the difference in eddy current signals between flat and curved specimens, the functional relationship between the eddy current signal difference and the shaft diameter was calculated. This function can be used to compensate the eddy current signal of the curved specimen, and correct the error caused by the existence of the curved surface. The feasibility verification was carried out through experiments, and the error analysis was performed on the distance measurement results of the flat specimen and the shaft with different diameters. The results show that compared with the traditional method of directly measuring the surface eddy current distance, the method reduces the distance measurement error of the curved specimen by more than 60%. This method significantly improves the accuracy of surface ranging, and can be applied to metal surface eddy current measuring.
Keywords: electromagnetic nondestructive testing;eddy current sensor;eddy current measuring;curved specimen
2021, 47(1):133-138 收稿日期: 2019-10-25;收到修改稿日期: 2019-12-31
基金项目: 国家自然科学基金项目（51667001）；北方民族大学重点科研项目（2019KJ36）；国家民委化工技术基础重点实验室一般科研项目（2017HG06）
作者简介: 佟宇(1996-),男,山西长治市人,硕士研究生,专业方向为机械损伤电磁无损检测及评价、涡流测距
参考文献
[1] 任吉林. 涡流检测技术近20年的进展[J]. 无损检测, 1998(5): 121-125, 128
[2] 徐志明. 涡流测距系统的仿真及设计[D]. 北京: 北京交通大学, 2008.
[3] 徐慧, 王诗鹏, 刘致秀, 等. 基于涡流技术的管道表面缺陷探测系统[J]. 仪表技术与传感器, 2019(4): 119-122, 126
[4] 赵云利, 于铁成, 周群, 等. 涡流检测磁化管道时频率对线圈阻抗的影响[J]. 无损检测, 2019, 41(1): 48-52
[5] 燕芳, 王志春, 丁东阳. 电涡流测厚系统特征值提取方法[J]. 传感器与微系统, 2019, 38(7): 18-20
[6] 肖俊生, 杜志杰, 王志春. 基于ANSYS的电涡流测厚仿真分析[J]. 传感器与微系统, 2018, 37(3): 26-28, 31
[7] 龚昌文. 内穿式涡流检测探头填充系数及应用浅析[J]. 云南化工, 2018, 45(10): 151-153
[8] 朱双霞. 电涡流无损检测技术综述[J]. 轻工科技, 2018, 34(9): 60-61
[9] 罗清旺. 基于电磁涡流的管道缺陷检测方法研究[D]. 成都: 电子科技大学, 2018.
[10] 岳秀芳. 曲面基体涡流测厚方法研究[D]. 太原: 中北大学, 2014.
[11] 胡鹏. 基于平板标定法的曲面涂层测厚精度分析[D]. 太原: 中北大学, 2013.
[12] 廉盟. 电涡流位移测量误差与被测面几何形貌的关系模型及补偿[D]. 大连: 大连理工大学, 2014.
[13] 张玉华, 孙慧贤, 罗飞路. 小曲率半径弧面涡流检测中探头提离干扰的抑制方法[J]. 中国电机工程学报, 2009, 29(27): 126-132
[14] 陈祥林, 丁天怀. 曲面间隙测量电涡流传感器探头的性能研究[J]. 测试技术学报, 2005(4): 437-441
[15] 张晓红, 胡文刚, 张琳, 等. 薄壁扁平不锈钢管的涡流检测工艺[J]. 宇航材料工艺, 2019, 49(3): 79-81
