Use of eddy current to non-destructively measure crack depth

摘要

A method and apparatus for non-destructively measuring the depth of a crack with precision and accuracy in a workpiece using an eddy current process. The method involves empirically creating a response curve of the eddy current response produced from crack(s) in a sample workpiece(s), wherein the depth of the crack(s) in the sample workpiece(s) may be modified a plurality of times and an eddy current response reading is taken at each different crack depth. The response curve is then used to interpolate the depth of a crack in a workpiece composed of the same material non-destructively by measuring the eddy current response in the workpiece crack and then obtaining the predetermined crack depth value form the response curve.