Review of Progress in Quantitative Nondestructive Evaluation
This paper reports on a type of multiple frequency eddy current NDE methodologies. A specific focus was placed on a multiple low frequency methodology that is suitable for case depth characterization of case‐hardened steel samples. A nominally uniform excitation field approach has been developed, and demonstrated to work for discriminating the case depths ranging between 1 mm and 6 mm, while meeting additional requirements of one‐sided access and a finite stand‐off distance.
American Institute of Physics
Nakagawa, Norio and Lo, Chester C.H., "Unconventionally high and low frequency eddy current methods for material surface characterizations" (2009). Center for Nondestructive Evaluation Conference Papers, Posters and Presentations. 63.