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An eddy current detection device and method for coating thickness of galvanized sheet for automobiles

A technology of coating thickness and detection device, applied in electromagnetic measurement device, electric/magnetic thickness measurement and other directions, can solve the problems of expensive equipment and harmful to human body, and achieve the effect of easy online detection, improved accuracy, stable and reliable non-destructive quantitative detection

Inactive Publication Date: 2018-03-30
CHINA UNIV OF MINING & TECH
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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

Method used

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  • An eddy current detection device and method for coating thickness of galvanized sheet for automobiles
  • An eddy current detection device and method for coating thickness of galvanized sheet for automobiles
  • An eddy current detection device and method for coating thickness of galvanized sheet for automobiles

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with accompanying drawing.

[0047] Such as figure 1 Shown, the present invention is a kind of eddy current detecting device of the coating thickness of galvanized sheet for automobile, and it comprises:

[0048] An eddy current probe, an impedance analyzer, a fixture for fixing the test piece 3-2, and a computer;

[0049] The eddy current probe is placed on the surface of the test piece 3-2 in the fixture, and is connected to the impedance analyzer, and the output end of the impedance analyzer is connected to the computer;

[0050]Wherein, the impedance analyzer generates a sinusoidal excitation signal to drive the eddy current probe to generate an excitation magnetic field and act on the tested object 3-2, and the eddy current probe senses and outputs a signal which is processed by the impedance analyzer and then input to a computer for analysis.

[0051] Such as figure 2 , image 3 As shown, th...

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Abstract

The invention discloses an eddy current detection device for the coating thickness of a galvanized sheet for automobiles, comprising an eddy current probe, an impedance analyzer, a fixture for fixing a tested piece and a computer; the eddy current probe is placed on the surface of the tested piece, Generate a sinusoidal excitation signal through the impedance analyzer, drive the eddy current probe to generate the excitation magnetic field, and also generate the eddy current magnetic field inside the test piece. The change is converted into an electrical signal and fed back to the impedance analyzer to obtain the inductance value. After the inductance value is processed by the zinc coating thickness detection data model established by the computer, the thickness of the coating of the tested piece can be obtained; at the same time, a device using the device is disclosed. In the detection method, the present invention selects the inductance value as the characteristic parameter of thickness measurement, improves the thickness measurement range and sensitivity, can realize fast and accurate online detection of the coating thickness of galvanized sheet, and has great potential economic benefits.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/06
Inventor 范孟豹吴啟菡王悦吴涛朱胜男王壮壮李一伍明张文文吴晶曹渤
Owner CHINA UNIV OF MINING & TECH
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