Journal
SENSORS
Volume 11, Issue 3, Pages 2525-2565Publisher
MDPI
DOI: 10.3390/s110302525
Keywords
non-destructive testing; eddy current; magnetic field; sensor; coil probe; impedance; crack; impedance plane; conductivity
Funding
- Junta de Castilla y Leon, Spain [VA034A10-2]
- Contratacion de personal investigador de reciente titulacion program
- Consejeria de Educacion of Junta de Castilla y Leon (Spain)
- European Social Fund
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Non-destructive techniques are used widely in the metal industry in order to control the quality of materials. Eddy current testing is one of the most extensively used non-destructive techniques for inspecting electrically conductive materials at very high speeds that does not require any contact between the test piece and the sensor. This paper includes an overview of the fundamentals and main variables of eddy current testing. It also describes the state-of-the-art sensors and modern techniques such as multi-frequency and pulsed systems. Recent advances in complex models towards solving crack-sensor interaction, developments in instrumentation due to advances in electronic devices, and the evolution of data processing suggest that eddy current testing systems will be increasingly used in the future.
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