Eddy currents techniques

SQID Eddy Current Technique Applying Conformable Eddy Current Probes. 

Principle of the Remote Field Eddy Current Technique... 

Identification. If the notch left by incomplete penetration emerges at a visually accessible surface, visual examination, perhaps aided by magnetic-particle or liquid-penetrant techniques, may reveal the defect. Otherwise, ultrasonics, radiography, or eddy-current techniques may have to be used. 

Eddy-current separation, 75 435 of nonferrous metallics, 75 455-457 Eddy-current separator, 27 447-448 Eddy-current technique, in nondestructive evaluation, 77 420 Eddy diffusion, 9 658 Eddy viscosity, 77 779 Eddy-viscosity-based models, 77 780 Edecrin, 5 169... 

Remote Fidd Eddy Current Technique (RFECT)... 

Thimble tubes are being inspected in the Spanish PWRs using eddy current techniques. The acceptance criteria for these inspections is a maximum thickness loss of 60%. The implementation of a procedure to isolate the leaking thimble tubes using automatic valves is being considered. 

Several components have been inspected using volumetric techniques. These methods must be qualified in terms of equipment, procedure, personnel and proven on a mock-up. Inspection technology has advanced substantially in recent years. Remote UT EC (Eddy Current) techniques are now available to inspect several internal components involving the top guide, access hole covers, core shroud and shroud head bolts. These techniques include the qualification of procedures for each specific configuration and application. These techniques have been demonstrated to be effective in in-situ inspection testing. 

For a characterization of materials with a low mechanical resistance and for routine measurements in industrial production, it would be of great importance to have a method which allows a contact-less, non-destmctive measurement of the resistance. One of the more recently developed techniques that is capable of such non-contact resistance measurement is the eddy current technique (Kraftmakher, 2000 Schroeder, 1998), which is mainly used in the semiconductor industry for wafer characterization (ASTM, 1996b) and is only recently entering display manufacturing as well (ASTM, 2002c). The technique is based on the effect that the quahty factor of a resonant circuit is reduced when a conducting... 

In magnetic eddy current techniques, oscillator coils above and below the film on an insulating substrate induce magnetic fields in the film, energy is dissipated, and the oscillator... 

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