Use of the Harmonic Analysis of an Induction Probe's Signal for Increasing the Information Content of Test Results
Source abstract
Abstract
The harmonic content of a probe's electromotive force when magnetic testing is conducted with the use of alternating fields is significantly affected by the possible presence of a flaw in the specimen. Magnetic biasing of the specimen with a static field enables identification of internal flaws in addition to surface flaws. The electromotive force's harmonic content depends on the flaw's dimensions and depth. This circumstance can be used to determine these parameters in a separate way. The effect of a gap between the surface of a tested specimen and the probe is significantly weaker on the topography and amplitude of higher harmonics than on the corresponding parameters of the first harmonic. This observation, which holds for both internal and surface flaws, enables testing of larger gaps.
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Research context
OpenAlex topics: Sensor Technology and Measurement Systems · Engineering Diagnostics and Reliability · Non-Destructive Testing Techniques
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References (5)
Show source-provided references
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