Eddy current detection device for automobile galvanized sheet plating thickness and method

Abstract

The invention discloses an eddy current detection device for automobile galvanized sheet plating thickness and a method. The eddy current detection device disclosed by the invention comprises an eddy current probe, an impedance analyzer, a clamp used for fixing a member to be tested and a computer; the eddy current probe is placed on the surface of the member to be tested and is used for generating a sine excitation signal through the impedance analyzer, driving the eddy current probe to generate an excitation magnetic field and generating a vortex magnetic field inside the member to be tested; the probe converts the magnetic field change caused by the thickness change to an electric signal which is returned to the impedance analyzer to obtain an inductance according to the various vortex magnetic fields generated by the members to be tested with various plating thickness; the inductance is processed by a galvanized layer thickness model established by a computer to obtain the thickness of the galvanized layer of the member to be tested; the invention also discloses a detection method using the same. The invention chooses the inductance as the characteristic parameter for measuring the thickness, improves the range and the sensitivity of measuring the thickness, realizes the fast and accurate on-line detection for the thickness of the plating thickness of the galvanized sheet and has a substantial and potential economic benefit.

Description

technical field [0001] The invention relates to a detection device and method for the coating thickness of a galvanized sheet for automobiles, in particular to an eddy current detection device and method for the coating thickness of a galvanized sheet for automobiles, and belongs to the technical field of electronic information and mechanical testing. Background technique [0002] With the continuous improvement of residents' consumption level, my country's automobile consumption is also increasing year by year. According to observations, when the per capita disposable income of urban residents across the country reaches a certain range, automobile consumption will accelerate significantly. This phenomenon has occurred five times since 1985; the latest acceleration occurred in 2013, when the annual automobile production exceeded 2200. million vehicles, a year-on-year increase of 14.8%. It is estimated that the per capita disposable income of urban households across the coun...

AI Technical Summary

Problems solved by technology

The ray method has the problem of protecting radioactive sources, the equipment is expensive, and harmful to the human body; the ultrasonic method needs to clean the surface of the test piece, and must use a couplant

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