This paper presents the method of magnetic-flux-leakage (MFL) detection and the characteristics of a giant-magnetoresistance (GMR) sensor. An experimental apparatus that uses a GMR sensor for oil-pipeline inspection is described. A permanent-magnet assembly was used to excite MFL signals. The magnet-assembly motion is in the inner pipeline and out the artificial defects. The GMR sensor liftoff is 2 mm. The result is shown. We can see that the artificial defects can be reliably detected with the GMR sensor. The magnetic field is a three-dimensional vector. For the Hall sensor, the measured magnetic field is parallel to the sensor chip. In contrast, for the GMR sensor, the measured magnetic field is perpendicular to the sensor chip. Thus, the sensor array can be designed on the basis of the Hall sensor and the GMR sensor. A Hall sensor and a GMR sensor can be arranged in a line along the axis orientation. A more useful signal will be produced; consequently, the pipeline defects nondestructive evaluation will become easier and more reliable.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A giant-magnetoresistance sensor for magnetic-flux-leakage nondestructive testing of a pipeline


    Additional title:

    Ein Riesenmagnetowiderstand zur zerstörungsfreien magnetischen Streuflussprüfung einer Pipeline


    Contributors:
    Chen, L. (author) / Que, P.W. (author) / Jin, T. (author)

    Published in:

    Publication date :

    2005


    Size :

    4 Seiten, 5 Bilder, 7 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Nondestructive Testing of Steel Corrosion in Prestressed Concrete Structures using the Magnetic Flux Leakage System

    Shams, Sadegh / Ghorbanpoor, Al / Lin, Shibin et al. | Transportation Research Record | 2018




    Magnetic flux leakage device for offshore oil pipeline defect inspection

    Jin, Tao / Que, Peiwen / Tao, Zhengsu | Tema Archive | 2005


    Giant Magnetoresistance Materials and Integrated Magnetic Sensors

    Smith, Carl H. / Brown, Jay L. | SAE Technical Papers | 1997