Results 241 to 250 of about 61,058 (296)

Eddy-Current Probe Design

1983
This paper describes theoretical and experimental work directed toward finding the optimum probe dimensions and operating frequency for eddy current detection of half-penny surface cracks in nonmagnetic conducting materials. The study applies to probes which excite an approximately uniform spatial field over the length of the crack at the surface of ...
Kincaid, Thomas, McCary, Richard
openaire   +2 more sources

Eddy-Current Reflection Probes: Theory and Experiment

Research in Nondestructive Evaluation, 1989
A general ΔZ theory of reflection-type eddy-current probes was recently developed for new types of robotic proximity sensors. In this paper, the theory is applied to the characterization of surface-connected flaws. Flaw signals were calculated using a finite-difference implementation of the ΔZ theory developed at Stanford University. A special air-core
B. A. Auld, J. C. Moulder, S. Jefferies, P. J. Shull, S. Ayter, J. Kenney   +5 more
openaire   +1 more source

Eddy current probe performance requirements

NDT International, 1990
Abstract : This study resulted in the development of a procurement specification for single-coil, absolute eddy current probes (shielded and nonshielded) which are used by the USAF with the Hocking UH-B (or equivalent) instruments for inspection of aluminum airframe structures.
G.L. Burkhardt, T.L. Allen, S.N. Rowland
openaire   +1 more source

Eddy current probe patterned in YBCO

IEEE Transactions on Appiled Superconductivity, 2001
Superconductive quantum interference devices (SQUIDs) coupled to arrays of small pickup loops can give images of millimeter fatigue cracks deep inside structures, using eddy currents. Coupling magnetic flux from a pickup loop to a SQUID commonly leads to a thousand fold loss.
W.N. Podney, J.M. Murduck
openaire   +1 more source

Eddy Current Probe Identification and Analysis

IEEE Transactions on Instrumentation and Measurement, 2017
This paper presents a new approach to the classical method for failure detection with eddy currents. In contrast to traditional methods of measuring reflected impedance on the probe circuit, this paper uses concepts of identification theory to find a transfer function that characterizes the dynamics of the measuring system by eddy currents.
Felipe A. Tondo, Rodrigo Wolff Porto, Luiz Frederico S. S. M. Villalobos, Valner J. Brusamarello, Luciola Campestrini   +4 more
openaire   +1 more source

Deep Penetrating Eddy Currents and Probes

Materials Testing, 2007
Abstract The eddy current skin-effect limits the detection of subsurface defects and the range of thickness measurement. Traditional concepts to estimate the penetration depth basing on plane wave propagation into a conducting halfspace cannot describe the real depth of inspection achievable by state-of-the-art sensors and instruments ...
Gerhard Mook, Olaf Hesse, Valentin Uchanin   +2 more
openaire   +1 more source

Mapping of Eddy Current Probe Fields

1986
An experimental determination of eddy current probe fields can be useful in several areas of nondestructive evaluation (NDE). In a very practical sense, a field map or profile is a good tool for examining the variations in probe performance. We show that probes of nominally identical construction can produce very different magnetic fields.
Capobianco, T., Fickett, F., Moulder, John   +2 more
openaire   +2 more sources

RF shielding and eddy currents in NMR probes

Journal of Magnetic Resonance, 2019
Shielding of the NMR sample by a thin coating of metal between the sample and the rf coil arises in some geometries. The shielding may be used for rf heating of the sample tube or for a high infrared reflectivity coating in cryoprobe applications. An important application is for a shield that prevents noise from entering the rf probe circuit while ...
Mark S, Conradi, Albert P, Zens
openaire   +2 more sources

INNOVATIVE EDDY CURRENT PROBE FOR MICRO DEFECTS

AIP Conference Proceedings, 2010
This paper reports the development of an innovative eddy current (EC) probe, and its application to micro‐defects on the root of the Friction Stir Welding (FSW). The new EC probe presents innovative concept issues, allowing 3D induced current in the material, and a lift‐off independence.
Telmo G. Santos, Pedro Vilaça, Jorge dos Santos, Luísa Quintino, Luís Rosado, Donald O. Thompson, Dale E. Chimenti   +6 more
openaire   +1 more source

Prediction of eddy current probe signal trajectories

IEEE Transactions on Magnetics, 1980
Development of computer based defect characterization schemes in quantitative eddy current nondestructive testing (NDT) requires an adequate mathematical model capable of describing the complicated interactions between the impressed and induced currents, primary and secondary fields and the flaws in materials.
R. Palanisamy, W. Lord
openaire   +1 more source