A method of determining eddy current instrument response from models

摘要

The output of a model of an eddy current test is typically the impedance change of a coil or probe. An eddy current instrument takes this impedance change and by means of the electronic circuits and instrument settings, modifies it to produce a screen display suitable for the operator. To predict the actual output of an eddy current test is, it is important to know the effect the instrument has on the impedance change as output by a model. By using the output of standard calibration situations, and using a mathematical transformation to estimate the instrument output equivalent to the impedance change produced in the models, the output of an instrument to a more general modelled situation can be estimated. This paper describes the method developed and gives some practical examples.