There are three types of electromagnetic testing, including eddy current testing, alternating current field measurement (ACFM) and remote field testing (RFT).Įddy current testing uses an alternating current coil to induce an electromagnetic field into the test piece, alternating current field measurement and remote field testing both use a probe to introduce a magnetic field, with RFT generally used to test pipes. This testing method uses an electric current or magnetic field which is passed through a conductive part. Leaks and active corrosion are detectable AE sources too. Frequently a method for use during proof tests of a pressure vessel, AE testing is also a continuous Structural Health Monitoring (SHM) method, for example on bridges. It is even possible to detect AE from plasticisation in highly stressed areas before a crack forms.
Sensors dispersed over the surface the structure detect the AE. This is a passive NDT technique, which relies on detecting the short bursts of ultrasound emitted by active cracks under a load. National Structural Integrity Research CentreĬurrent NDT test methods include: Acoustic Emission Testing (AE).Structural Integrity Research Foundation.
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