Study of the new eddy current non-destructive testing sensor on ferromagnetic materials

A new eddy current non-destructive testing (NDT) sensor developed at NASA Langley Research Center can accurately detect fatigue cracks and measure material and non-conducting coating thicknesses. This paper presents experimental and finite element modeling data on the characteristics of the sensor on ferromagnetic materials. Fatigue crack detection and lift-off characteristics in steel and aluminum are compared and discussed. >