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Eddy Current Array Tutorial; An introduction to eddy current testing from the NDE/NDT resource center Archived 2006-05-07 at the Wayback Machine; Intro to Eddy Current Testing by Joseph M. Buckley (pdf, 429 kB) Eddy Current Testing at Level 2, International Atomic Energy Agency, Vienna, 2011 (pdf 5.6 MB).
In electromagnetism, an eddy current (also called Foucault's current) is a loop of electric current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction or by the relative motion of a conductor in a magnetic field. Eddy currents flow in closed loops within conductors, in planes ...
Eddy current sensors are displacement sensors that use the principle of eddy current formation to sense displacement. These sensors measure shaft displacement in rotating machinery and have been around for many years as they offer manufacturers high-linearity, high-speed measurements, and high resolution. [ 1 ]
Although RFT works in nonferromagnetic materials such as copper and brass, its sister technology eddy-current testing is preferred. The basic RFT probe consists of an exciter coil (also known as a transmit or send coil) which sends a signal to the detector (or receive coil). The exciter coil is pumped with an AC current and emits a magnetic field.
Alternating current field measurement (ACFM) is an electromagnetic technique for non-destructive testing detection and sizing of surface breaking discontinuities. It was derived from the methods used in eddy-current testing and works on all metals, ferrous or non-ferrous. Since it doesn't require direct electrical contact with the surface it ...
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Skin depth has a major influence on eddy current losses, was missing from the formula, and has the correct dimension so the units on left and right side match. Henkdeleeuw 05:54, 23 February 2010 (UTC) Units still don't add up in the current article. When I check T^2*m^2*Hz^2/(Ohm*m*m) I get kg/(s^3*m^2), but power is kg*m^2/s^3.
Bently Nevada was the first to successfully apply eddy-current technology for use in non-contacting displacement sensors. This type of electronic sensor is typically used to measure very small distances between the tip of the sensor and a conductive surface, such as rotating shaft. [ 13 ]