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Metrology in Electromagnetic Nondestructive Testing: Correct Evaluation of Test Parameters

Metrology is very important for the correct and effective application of NDT. As it is well known, the accurate direct evaluation of the metrological parameters of NDT devices (measuring accuracy, limit of sensitivity, etc.) and technologies is not so easy. Reference standards with artificial defects are widely used to prove instrument performance. Real testing conditions in practice may differ significantly from that used by metrological calibration. To avoid possible misunderstanding one should take into consideration this difference and check the parameters at the real conditions. This concerns all of NDT devices and methods but especially of electromagnetic and MFL ones, when they are used for testing of ferromagnetic objects such as steel wire ropes. The paper can be helpful for specialists at their practice in electromagnetic and MFL NDT of ferromagnetic objects, first of all, in steel wire ropes NDT.

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