Method and device for detecting thickness and conductivity of metal coating on surface of metal conductor

Abstract

The invention discloses a method and device for detecting the thickness and conductivity of a metal coating on the surface of a metal conductor. The method comprises the following steps: generating astandard curve of normalized apparent conductivity according to the characteristics of different coating thicknesses, conductivities and substrate conductivities; acquiring an experimental curve of the equivalent conductivity according to a relationship between the equivalent conductivity of a specific coated conductor to be measured and the penetration depth of an electromagnetic wave under different excitation source frequencies; and determining parameters of a to-be-measured flat plate, and calculating the conductivity of a metal coating and the conductivity of a thickness substrate metal conductor according to the standard curve and the experimental curve. According to the method, the thickness, the conductivity and the substrate conductivity of the micron-order metal coating can be detected at the same time in a high-precision, rapid and nondestructive manner without prior experimental data, and the method is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of coating thickness and electrical conductivity detection, in particular to a method and device for detecting the thickness and electrical conductivity of a metal coating on the surface of a metal conductor. Background technique [0002] At present, the detection methods of coating thickness and electrical conductivity mainly include: magnetic thickness measurement method, which is suitable for the measurement of the thickness of the non-magnetic layer on the magnetic conductive material; eddy current thickness measurement method, which is suitable for the measurement of the thickness of the non-conductive layer on the conductive metal; ultrasonic thickness measurement The method is suitable for the measurement of the thickness of multi-layer coatings, but it is generally expensive and the measurement accuracy is not high; the electrolytic thickness measurement method needs to destroy the coating layer, the ...

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Problems solved by technology

[0004] However, these methods have certain limitations in practical applications. For example, in practical applications, the coating thickness and conductivity are unknown, and it is difficult to find one parameter by knowing another parameter; the inversion algorithm needs The calculation of the theoretical formula of coil impedance is complicated; the look-up table method needs to establish a standard table first, and the accuracy depends on the amount of data in the table

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