Wirbelstrom
Eddy current array (ECA) and conventional ECT share the same basic working principles. ECA technology provides the ability to electronically drive an array of coils ( multiple coils) arranged in specific pattern called a topology that generates a sensitivity profile suited to the target defects. Data acquisition is achieved by [[multiplexing]] the coils in a special pattern to avoid mutual [[inductance]] between the individual coils. The benefits of ECA are: