Method and apparatus for determining the thickness of several la

Details Method and apparatus for determining the thickness of several la Method and apparatus for determining the thickness of several la

1996-07-12

1999-03-30

Strecker, Gerard

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

32420716, 324232, 324233, 702170, G01B 706, G01N 2772, G01R 3312

Patent

active

058894012

ABSTRACT:
A method and apparatus for determining the thickness of at least one layer superimposed on a substrate, at least one of the layers or the substrate being a conductor of electricity. The method includes the steps of generating an electromagnetic alternating field in the vicinity of the outer most layer with a coil in order to cause any currents to be generated in the conductor which act upon the alternating field. The frequency of the alternating field is adjusted to at least two different frequencies and is measured at these frequencies. The thickness of the layers is then determined based on the measurements and the electromagnetic properties of the substrate and the layers.

REFERENCES:
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patent: 4695797 (1987-09-01), Deutsch et al.
patent: 5017869 (1991-05-01), Oliver
patent: 5191286 (1993-03-01), Fischer
patent: 5453689 (1995-09-01), Goldfine et al.
patent: 5525903 (1996-06-01), Mandl et al.
Higuchi et al., Effect of Nodular Corrosion Density on Thickness Measurement by Eddy-Current Technique, pp. 749-756, undated.
Eddy Current Inspection of Non-Ferromagnetic Tubing Zetec Level II, Course ETS 200, 64 pages.

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