Determination of the thickness of a coating on a highly elongate

Details Determination of the thickness of a coating on a highly elongate Determination of the thickness of a coating on a highly elongate

1983-08-04

1986-06-03

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324234, G01B 710, G01R 3312

Patent

active

045932441

ABSTRACT:
A method for facilitating the determination of the thickness of a coating on an article, especially a highly elongate article such as a wire, having a ferromagnetic substrate for the coating, the coating being electrically conductive and of substantially lower magnetic permeability than the substrate, includes disposing in proximity to the article an inductively wound wire coil while applying an alternating electrical current to the coil. An electrical property of the coil is monitored for deriving a signal or other indication representative of the monitored property. The thickness of the coating may be determined from this indication. Apparatus for performing the method includes an inductively wound wire coil positionable in proximity to the article; a circuit for applying an AC current to the coil; and circuitry for monitoring the electrical property and deriving the signal or other indication.

REFERENCES:
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patent: 2703384 (1955-03-01), Rendel
patent: 2916694 (1959-12-01), Hanysz et al.
patent: 3255405 (1966-07-01), French
patent: 3585495 (1971-06-01), Kubo et al.
patent: 3757208 (1973-09-01), Brunner
patent: 3854084 (1974-12-01), Parker
"Ceramic Thickness Gage"; Instruments vol. 24, Jun. 1951, pp. 692 and 694.
Hanysz, Eugene A., "Swept Frequency Eddy-Current Device to Measure Overlay Thickness, The Review of Scientific Instruments vol. 29, No. 5, May 1958, pp. 411-415.
Latter, T. D. T., Measuring the Thickness of Protective Coatings by Eddy Currents British Journal of NDT, vol. 14, No. 4, Jul. 1972, pp. 122, 123.

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