Results 251 to 260 of about 19,462 (303)

Optimized complex signals for Eddy Current Testing

2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014
The choice of optimized excitation devices and strategies is now interesting recent studies about Non Destructive Eddy Current Testing (ND-ECT). Recently, the attention has been paid to the use of complex excitation signals, meant as signals different from the sinusoidal ones and with wide frequency content. In particular, some studies have highlighted
Giovanni Betta, Luigi Ferrigno, Marco Laracca, Pietro Burrascano, Marco Ricci 0001   +4 more
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Nondestructive Eddy Current Testing

IEEE Transactions on Instrumentation and Measurement, 1972
When a coil is placed in proximity to a conductor, the magnetic field in the vicinity of the coil is altered by eddy currents in the conductor. The conductivity of a sample material may be determined by measuring the field. Closed-form solutions are presented for the magnetic field at the surface of a semi-infinite conductor for two cases: a semi ...
Alan L. Jones, Karl F. Pezdirtz
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Polyphase eddy current testing

Journal of Applied Physics, 1994
Polyphase eddy current testing is proposed. The operating principle of this system is as follows. The polyphase eddy current testing system may be regarded as one of the polyphase transformers. Primary balanced polyphase coils are star connected and secondary polyphase circuits are composed of the target.
I. Marinova, S. Hayano, N. Ishida, Y. Saito, Y. Hirama, M. Yamamoto   +5 more
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Eddy Current Testing

Aircraft Engineering and Aerospace Technology, 1986
Eddy current testing is a general term for the inspection of conductive materials using an induced electro‐magnetic field. The flow of this field is affected by the presence of defects within the material and the charges are detected by suitable instruments which reveal their location and nature.
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Massively Multiplexed Eddy Current Testing and its Comparison with Pulsed Eddy Current Testing

AIP Conference Proceedings, 2004
This compares the capabilities of the Pulsed Eddy Current technique with those of an Eddy Current instrument capable of multiplexing through 32 discrete frequencies. Pulsed Eddy Current testing has shown some definite advantages due to the application of an extended series of frequencies to a test piece and analysis using a time‐based display. The Eddy
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The Pulsed Eddy Current Testing

2016
As one kind of eddy current testing technology, the pulsed eddy current testing technology is based on the principle of electromagnetic induction and is used to detect the defects in conductive materials. The principle of pulsed eddy current testing is basically the same as that of traditional eddy current testing, and differences are the means of ...
Songling Huang, Shen Wang
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Eddy current testing of metals

Materials & Design, 1987
Abstract Eddy currents can be used for testing metals for changes in composition, structure and hardness, and for detecting and measuring surface and sub-surface defects. They can also be applied to measuring changes in dimensions of rods and tubes and of thickness of metal plates and of non-metallic coatings on metal substrates and of metal coatings
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Pulsed Eddy-Current Nondestructive Testing of Ferromagnetic Tubes

IEEE Transactions on Instrumentation and Measurement, 2004
In sinusoidal eddy current nondestructive testing (NDT) of thick ferromagnetic tubes, wall thickness is measured with the coils displaced for 2-3 tube diameters (remote field eddy current technique). The tube inner diameter is measured at higher frequency with another pair of coils displaced for around 1 tube diameter (electrical caliper).
Darko Vasic, Vedran Bilas, Davorin Ambrus   +2 more
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Eddy current testing instruments

Physics Bulletin, 1988
Eddy current testing is a means of nondestructively testing electrically conducting materials and is most widely used for production and in-service testing of high integrity components and structures such as nuclear reactor tubing and airframe fastener joints.
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Improvement of Eddy Current Distribution Induced by Exciting Coil in Eddy Current Testing

2006 12th Biennial IEEE Conference on Electromagnetic Field Computation, 2006
Eddy current testing (ECT) using sinusoidal excitation is practical in various fields and its electromagnetic phenomena is becoming clear by using numerical analysis. On the other hand, some problems are remained in ECT technology: for example, high-sensitivity detection, testing for magnetic material, thick structure. In this paper, in order to obtain
H. Tsuboi, N. Seshima
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