Patent ID: 7688067
Filing Date: 2010-03-30
Classification: G01N,G01R

Abstract:
1. An eddy current measuring device, comprising: a flexible base comprising a front surface that comes in contact with a test body; a signal coil; an excitation coil; wherein the signal coil and the excitation coil are arranged in a planar form in a single layer on a rear surface of the flexible base; and a flexible rear layer comprising a ferrite particle material that at least partially covers and contacts the signal coil and the excitation coil; wherein the flexible base, the signal coil, the excitation coil, and the flexible rear layer are assembled in a flexible stack of layers that remains sufficiently flexible to allow the stack to be variably matched to radii of curvature on a surface of the test body; and wherein the flexible base is a flexible sheet with a thickness of about 25 microns, the coils each have a thickness of about 17 microns, and the ferrite particle material extends over a thickness of about 200-600 microns.