Magnetic flux leakage nondestructive testing with large lift-off
-
摘要: 漏磁检测是一种重要的无损检测方法，广泛应用于石油、钢铁等行业。在漏磁检测中，提离值是最重要的工艺参数之一。就保护探头或曲面检测的角度而言，通常传感器与工件之间始终保持一定的提离值，但漏磁场随提离值的增大会迅速衰减，降低了检测的灵敏度和信噪比。因此如何实现大提离下的高精度漏磁检测，一直以来都是研究的热点。首先探讨了提离值的定义及提离值对漏磁信号的影响；归纳了信源、传递介质以及传感器这3个大提离检测的要素，并根据这3个要素，总结归纳了目前国内外学者提出的诸多大提离漏磁检测方法并介绍了基于转变检测对象的大提离检测方法；最后讨论了大提离漏磁检测方法目前仍存在的问题以及其发展趋势。Abstract: Magnetic flux leakage testing is an important nondestructive testing method, which is widely used in petroleum, steel, and other industries. In magnetic flux leakage detection, the lift-off value is one of the most important parameters. Generally, from the perspective of protecting the probe or curved surface detection, a certain lift-off value needs to be maintained between the sensor and the workpiece. However, the leakage magnetic field decays rapidly with the increase of lift-off value, which reduces the sensitivity and signal-to-noise ratio of detection. Therefore, how to make the sensor realize high-precision magnetic flux leakage detection under large lift-off has been an important research focus. Firstly, this paper discusses the definition of lift-off value and introduces the influence of lift-off value. Secondly, three elements of large lift-off detection are summarized. They are the source, transmitting medium, and sensors. According to the above influencing factors, many magnetic flux leakage detection methods proposed by domestic and foreign scholars are summarized. In addition, the method based on transformation detection object is also introduced. Finally, the existing problems and the development trend of large lift-off magnetic flux leakage detection methods are discussed.
-
-
[1] 周志新.机械裂纹无损检测方法综述[J].机电工程,2017,34(10):1138-1143. [2] 林俊明.漏磁检测技术及发展现状研究[J].无损探伤,2006,30(1):1-5. [3] WU D H,ZHANG Z Y,LIU Z L,et al.3-D FEM simulation and analysis on the best range of lift-off values in MFL testing[J].Journal of Testing and Evaluation,2015,43(3):20130133.
[4] HUANG Z Y,QUE P W,CHEN L. 3D FEM analysis in magnetic flux leakage method[J]. NDT & E International. 2006, 39(1):61-66.
[5] 崔伟,黄松岭,赵伟.传感器提离值对管道漏磁检测的影响[J].清华大学学报(自然科学版),2007,47(1):21-24. [6] 任吉林,林俊明.电磁无损检测[M].北京:科学出版社,2008. [7] SUN Y H,KANG Y H.Magnetic compression effect in present MFL testing sensor[J].Sensors and Actuators A:Physical,2010,160(1/2):54-59.
[8] 孙燕华,康宜华.一种基于磁真空泄漏原理的漏磁无损检测新方法[J].机械工程学报,2010,46(14):18-23. [9] SUN Y H,LIU S W,JIANG X Y,et al.A novel electromagnetic testing method based on the magnetic field interaction[J].IEEE Transactions on Magnetics,2019,55(8):1-12.
[10] WU J B,FANG H,LI L,et al.A lift-off-tolerant magnetic flux leakage testing method for drill pipes at wellhead[J].Sensors,2017,17(12):201.
[11] MA Y L,HE R Y,CHEN J Z.A method for improving SNR of drill pipe leakage flux testing signals by means of magnetic concentrating effect[J].IEEE Transactions on Magnetics,2015,51(9):1-7.
[12] LEE J Y,JUN J,KIM J,et al.Electromagnetic nondestructive testing at high lift-off using a magnetic image conduit[J].Journal of Mechanical Science and Technology,2013,27(5):1287-1293.
[13] LEE J Y,SEO D W,SHOJI T.Numerical consideration of magnetic camera for quantitative nondestructive evaluation[J].Key Engineering Materials,2004,270/271/272/273:630-635.
[14] 曹江伟,王锐,王颖,等.隧穿磁电阻效应磁场传感器中低频噪声的测量与研究[J].物理学报,2016,65(5):304-310. [15] 刘竹琴,白泽生.传感器电路的噪声及其抗干扰技术研究[J].现代电子技术,2011,34(14):161-165. [16] WANG C Y,SU W,HU Z Q,et al.Highly sensitive magnetic sensor based on anisotropic magnetoresistance effect[J].IEEE Transactions on Magnetics,2018,54(11):1-3.
[17] PELKNER M,NEUBAUER A,REIMUND V,et al.Routes for GMR-sensor design in non-destructive testing[J].Sensors,2012,12(9):12169-12183.
[18] 张继楷,杨芸,康宜华,等.TMR传感器及其在电磁检测中的应用[J].无损检测,2016,38(12):36-39,67. [19] 沈铭鸿.基于TMR磁传感器的无损检测技术研究[D].苏州:苏州大学,2019. [20] JIN Z H,MOHD NOOR SAM M,OOGANE M,et al.Serial MTJ-based TMR sensors in bridge configuration for detection of fractured steel bar in magnetic flux leakage testing[J].Sensors (Basel,Switzerland),2021,21(2):668.
[21] WU D H,SU L X,WANG X H,et al.A novel non-destructive testing method by measuring the change rate of magnetic flux leakage[J].Journal of Nondestructive Evaluation,2017,36(2):1-11.
[22] WANG R B,DENG Z Y,LIU R,et al.A large lift-off nondestructive testing method based on the interaction between AC magnetic field and MFL field[C]//23rd International Workshop on Electromagnetic Nondestructive Evaluation.Detroit:IOS Press,2019
[23] 田鸿立.国内外录磁探伤成象技术综述[J].无损检测,1988,10(12):360-362. [24] YANG Y,LI L,DENG Z Y,et al.Theoretical analysis and simulation of a new SNR improvement method for the rough surface crack in MFL detection[J].International Journal of Applied Electromagnetics and Mechanics,2016,52(3/4):1401-1408.
计量
- 文章访问数: 10
- HTML全文浏览量: 0
- PDF下载量: 2
下载:
