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@ARTICLE{Krause:40670,
      author       = {Krause, H.-J. and Wolf, W. and Glaas, W. and Zimmermann, E.
                      and Faley, M. M. and Sawade, G. and Neudert, G. and Gampe,
                      U. and Krieger, J.},
      title        = {{SQUID} system for magnetic inspection of prestressed
                      tendons on concrete bridges},
      journal      = {Insight},
      volume       = {43},
      issn         = {1354-2575},
      address      = {Northampton},
      publisher    = {British Institute of Non-Destructive Testing},
      reportid     = {PreJuSER-40670},
      pages        = {458 - 461},
      year         = {2001},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Superconducting quantum interference devices (SQUIDs) are
                      magnetic field sensors with the highest sensitivity and
                      largest dynamic range known to date. In a joint German
                      $R\&D$ project, the authors are developing a multi-channel
                      SQUID system for non-destructive detection of tendon
                      ruptures in prestressed members of bridges. The system uses
                      the magnetic stray field measuring method. The tendons are
                      magnetised by means of a yoke magnet scanning along the
                      members. The magnetic stray field during magnetisation or
                      the remanent field subsequent to magnetisation is measured
                      using four SQUID sensors mounted in the yoke. Signals from
                      stirrups of the mild steel reinforcement are suppressed with
                      two types of techniques: either a best fit of typical
                      stirrup signals to the stray field signal and their
                      substraction, or the comparison of remanent field signals
                      after changing the magnetisation direction of the stirrups.
                      Subsequent correlation analysis with the dipolar signal of a
                      typical void yields a rupture probability distribution and
                      rupture signal amplitudes. Results of measurements on a
                      prestressed concrete highway bridge are presented. At three
                      locations, signal amplitudes above the threshold values were
                      found. Two of them were verified by opening the bridge deck.
                      In one case, one out of eight wires in the strand was
                      broken, in the other case two. Thus, it was shown that the
                      unsurpassed sensitivity and dynamic range of SQUID sensors
                      can be applied to localise ruptures in prestressed members
                      of bridges.},
      keywords     = {J (WoSType)},
      cin          = {ISG-2 / ZEL / IFF-IMF},
      ddc          = {600},
      cid          = {I:(DE-Juel1)VDB42 / I:(DE-Juel1)ZEL-20090406 /
                      I:(DE-Juel1)VDB37},
      pnm          = {Schichtsysteme und Bauelemente der Supraleiterelektronik /
                      Detektoren, Signal- und Bildverarbeitung für Neutronen-,
                      Gamma- und Röntgenstrahlung},
      pid          = {G:(DE-Juel1)FUEK65 / G:(DE-Juel1)FUEK102},
      shelfmark    = {Instruments $\&$ Instrumentation / Materials Science,
                      Characterization $\&$ Testing},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000169866000012},
      url          = {https://juser.fz-juelich.de/record/40670},
}