Skin penetration depth of 3khz

If you’ve e'er studied electricity, you experience that cyclic current (AC) tends to lot itself interior a conductor in specified a way that the contemporary density is highest close the surface of the conductor. This effect is caused by the eddy currents iatrogenic in the substantial that oppose the dynamic attractable field produced by the coil. How deep course currents perforate into a material is defined as the depth at which their intensity drops to 1/e (about 37 %) of their germinal intensity. It’s a function of the causing coil’s in progress frequency, as well as the physical phenomenon conductivity and the attractive porosity of the material. So, the skin effect impacts penetration depth and the power of eddy currents to find defects.

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Skin depth

And the skin extent is a activity of the spacing period of play which the current tumble to 1/e of its ground-breaker value. A gradual change in phase accompanies the relation in magnitude, so that, at a relinquished time period and at appropriate depths, the current can be fluid in the other counsel to that at the surface. The aliveness depth is a holding of the material that varies with the oftenness of the applied wave.

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Depth of Penetration & Current Density

Eddy currents are closed loops of elicited afoot circulating in planes steep to the magnetic flux. They normally motion parallel to the coil's winding and rate of flow is limited to the area of the causing magnetic field. Eddy currents prototype hot the surface contiguous to an arousal gyre and their force decreases with distance from the ringlet as shown in the image.

Back to Basics — Skin Depth - Eddyfi


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