1987
DOI: 10.1007/bf00568889
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Geometrically anisotropic probes: an improved eddy current technique

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Cited by 3 publications
(3 citation statements)
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“…The pancake coil geometry (System I) is perhaps the most widely used in practice. As all the configurations are 'geometrically anisotropic' they are well suited to detection of directional defects, such as fatigue cracks (Mayos and Muller 1987). Coil configurations such as Systems V and VI, for which Z 12 = 0 irrespective of frequency, separation and liftoff, are significant because any change in mutual impedance must, in principle, be due to the presence of a defect.…”
Section: Discussionmentioning
confidence: 99%
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“…The pancake coil geometry (System I) is perhaps the most widely used in practice. As all the configurations are 'geometrically anisotropic' they are well suited to detection of directional defects, such as fatigue cracks (Mayos and Muller 1987). Coil configurations such as Systems V and VI, for which Z 12 = 0 irrespective of frequency, separation and liftoff, are significant because any change in mutual impedance must, in principle, be due to the presence of a defect.…”
Section: Discussionmentioning
confidence: 99%
“…The response of driver-pickup coil systems is dictated by the change in mutual impedance due to the defect, and the coil configuration is designed to minimize the effects of coil liftoff, temperature fluctuations and other sources of unwanted signals while maximizing the defect response. Practical applications of driver-pickup coil arrangements include axisymmetric reflection probes for measurement of conductivity and coating thickness (Deeds et al 1979), through-transmission systems for characterization of metallic sheets (Dodd and Deeds 1982), circular-driver/differential-pickup coils for surface crack detection (Auld et al 1989), remote-field eddy-current systems for pipe inspection (Schmidt 1989, Haugland 1996 and sliding coils for detection and sizing of cracks in lap joints and heat-exchanger tubing (Mayos and Muller 1987, Cecco et al 1993, Obrutsky et al 1996. More complex configurations, which rely on orthogonal driver-pickup coils, have also been proposed for detecting and sizing defects in other specialized applications (Beissner and Sablik 1984, Popa et al 1997, Grimberg et al 2000, Hoshikawa et al 2001.…”
Section: Introductionmentioning
confidence: 99%
“…these results explain the advantages of eC probes in which the sensing (receive) and the drive (transmit) coils are spaced apart. eddy current probes with spaced coils were named transmit-receive or anaxial eC probes and investigated in detail in a few publications [19][20][21]. In these studies, the specific useful peculiarities of these probes, such as high penetration and noise tolerance, were shown.…”
Section: General Considerations On the Penetration Of Eddy Currents I...mentioning
confidence: 99%