INDUCTANCE COIL UNIT WITH PERMANENT MAGNET Russian patent published in 2017 - IPC H01F27/30 G01N29/22 

FIELD: electricity.

SUBSTANCE: unit of inductance coils has at least three spiral inductance coils arranged in a row on a substrate made of dielectric material. The permanent magnet is arranged above the inductance coil unit. The adjacent spiral inductance coils on the substrate are located on different sides relative to longitudinal axis of the substrate.

EFFECT: increase of defect detection accuracy, reduction of defect detection time, contactless excitation and reception of acoustic wave at specified angle, forming a horizontally polarized wave that is not transformed into other types of waves when falling at the interface between the control object and the environment.

8 cl, 2 dwg