Circumferentially compensating eddy current probe with alternately polarized transmit coils and receiver coils

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The Atomic Energy Of Canada Limited patent solves the following problem:

Eddy current testing is a non-destructive test techniques based on inducing electrical currents in the material examined and observed the interaction between these currents and the material. Eddy currents generated by the electromagnetic coil in the test probe, and monitor simultaneous investigation by measuring electrical impedance. Because it is an electromagnetic induction process, direct electrical contact with the sample is not required; However, the sample material should be electric conductive.

Our analysis of this patent is as follows:

Atomic Energy Of Canada Limited’s patent US 4808924 A deals with Circumferentially compensating eddy current probe with alternately polarized transmit coils and receiver coils.
An Eddy current probes capable of detecting defects independent of orientation, with full circumferential coverage tube, under the support plates, and others, are disclosed. investigation of the use of many coil, moving send-receive the way, another coil electromagnetically polarized in opposite directions. The investigation detects local defects and eliminates the concentric difference.

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