Eddy current method of acquiring the surface layer properties of

Details Eddy current method of acquiring the surface layer properties of Eddy current method of acquiring the surface layer properties of

1994-08-18

1996-06-11

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324226, 324227, 324238, G01B 706, G01B 734, G01N 2790

Patent

active

055259030

ABSTRACT:
A sensor arrangement and a method of acquiring properties of the surface layer (3) of a metallic target (2), which allow a nondestructive and substantially distance-independent measurement to be performed, with the requirements to be met by the sensor positioning being minimal. The sensor arrangement (1) comprises a combination of at least one eddy-current sensor (5) with at least one displacement measuring sensor (6), the depth of penetration of the eddy currents generated by the eddy-current sensor (5) corresponding to at least twice the thickness of the surface layer (3), and the displacement measuring sensor (6) serving to determine the distance of the sensor arrangement (1) from the target surface (4). The measuring signals of the eddy-current sensor (5) and the displacement measuring sensor (6) are evaluated on the basis of a hypothetical depth of penetration of the eddy currents, which is to be determined as a function of the frequency of the eddy currents and of the conductivity and permeability of the base material (8) of target (2).

REFERENCES:
patent: 4977853 (1990-12-01), Falcoff et al.
patent: 5355083 (1994-10-01), George et al.

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