GMR Sensor Arrays for High-Spatial Resolution Measurements in NDT-Applications

  • Magneto resistive (MR) sensors are suited for a wide range of different applications. Especially due to their small sizes and their frequency-independent behaviour, they are eligible candidates for non-destructive testing methods where high spatial resolution is required. The use of specialized magnetic field probes enables not only a defect evaluation, but also a localized characterization of ferromagnetic materials. This paper presents some NDT (non-destructive testing) examples concerning magnetic flux leakage applications (MFL) and eddy current testing (ET). For MFL-testing we used an NDT-adapted GMR (Giant MR) sensor array for the detection of small inclusions in thin steel sheets. We also investigated the effects of microstructure on magnetic properties using GMR sensors. The ET-example describes an MR array probe consisting of 32 MR-elements, an ASIC, subsequent readout components and a one-wire excitation to generate eddy currents inside the material (developed in theMagneto resistive (MR) sensors are suited for a wide range of different applications. Especially due to their small sizes and their frequency-independent behaviour, they are eligible candidates for non-destructive testing methods where high spatial resolution is required. The use of specialized magnetic field probes enables not only a defect evaluation, but also a localized characterization of ferromagnetic materials. This paper presents some NDT (non-destructive testing) examples concerning magnetic flux leakage applications (MFL) and eddy current testing (ET). For MFL-testing we used an NDT-adapted GMR (Giant MR) sensor array for the detection of small inclusions in thin steel sheets. We also investigated the effects of microstructure on magnetic properties using GMR sensors. The ET-example describes an MR array probe consisting of 32 MR-elements, an ASIC, subsequent readout components and a one-wire excitation to generate eddy currents inside the material (developed in the EU-funded IMAGIC-project , 2011-2014, 7th Framework Programme). Using this MR-probe we achieved results with a better spatial resolved defect detection of neighbouring boreholes compared to “conventional” ET-probes.zeige mehrzeige weniger

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Metadaten
Autor*innen:Matthias Pelkner
Koautor*innen:Robert Stegemann, Rainer Pohl
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
DDC-Klassifikation:Naturwissenschaften und Mathematik / Chemie / Analytische Chemie
Freie Schlagwörter:Eddy current testing; GMR; Magnetic flux leakage
Veranstaltung:14th Symposium Magnetoresistive Sensors and Magnetic Systems
Veranstaltungsort:Wetzlar, Germany
Beginndatum der Veranstaltung:21.03.2017
Enddatum der Veranstaltung:22.03.2017
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:27.03.2017
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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