Skin effect-based sample surface coating nondestructive test method and system

A non-destructive testing and skin effect technology, applied in measuring devices, electromagnetic measuring devices, electromagnetic/magnetic thickness measurement, etc., can solve problems such as large errors, achieve high detection efficiency, high detection sensitivity, and achieve the effect of automatic measurement

Active Publication Date: 2016-06-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Conventional coating thickness detection methods mainly include: weighing method, electric quantity method, metallographic microscopy method, magnetic field method, magnetic force method, electromagnetic induction method, eddy current method, X-ray method, β-ray method, electron microscopy method, B-ultrasound method, Chemical methods, etc., these methods are sample local analysis methods, some are destructive detection methods, and the error is also large

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  • Skin effect-based sample surface coating nondestructive test method and system
  • Skin effect-based sample surface coating nondestructive test method and system
  • Skin effect-based sample surface coating nondestructive test method and system

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Embodiment 1

[0049] Embodiment 1, a non-destructive testing method for sample surface coating based on the skin effect, the following will be combined with the attached figure 1 A non-destructive testing method for sample surface coating based on the skin effect of the present invention is introduced in detail.

[0050] Such as figure 1 As shown, a non-destructive testing method based on the skin effect of the sample surface coating, including the following steps:

[0051] Step 1: Use an AC signal with a variable frequency to act on both ends of the sample to be tested;

[0052] Step 2: Gradually increase the frequency of the AC signal, and detect the resistance or voltage at both ends of the sample to be tested corresponding to the AC signal of different frequencies, and perform curve drawing to obtain the resistance-frequency curve or voltage- frequency curve;

[0053] Step 3: According to the resistance-frequency curve or voltage-frequency curve of the sample to be tested, analyze th...

Embodiment 2

[0092] Embodiment 2, a non-destructive testing system based on the skin effect of the sample surface coating, the following will be combined with the attached figure 2 A non-destructive testing system for sample surface coating based on the skin effect of the present invention will be described in detail.

[0093] Such as figure 2 As shown, a non-destructive testing system based on the skin effect of the sample surface coating, including a signal source module, a signal acquisition module and a main control module.

[0094] Wherein, the signal source module is used to provide frequency-adjustable AC signals for both ends of the sample to be tested; the signal acquisition module is used to detect the resistance or voltage at both ends of the sample to be tested when AC signals of different frequencies act on the sample to be tested and sent to the main control module; the main control module is used to draw a curve according to the resistance or voltage at both ends of the s...

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Abstract

The invention relates to a skin effect-based sample surface coating nondestructive test method and system. The method comprises acting two ends of a sample to be detected through a frequency-variable AC signal, gradually increasing AC signal frequency, detecting resistance or voltage at the two ends of the sample to be detected, wherein the resistance or voltage is corresponding to AC signals with different frequencies, drawing a resistance-frequency curve or a voltage-frequency curve of the sample to be detected, analyzing a rule of change of the resistance change amounts of the sample to be detected or the voltage change amounts of two ends of the sample to be detected along with frequency change, and carrying out calculation or comparison with a standard sample to obtain thickness of the coating on the sample to be detected. The method and system realize integral measurement of the sample to be detected, has high detection sensitivity, realizes automatic measurement and has high detection efficiency. Through the skin effect, the surface defects of the material at high frequency are sensitive to a high frequency signal. Through change of AC signal frequency, coating surface defect and crack depth distribution information is acquired.

Description

technical field [0001] The invention relates to the technical field of coating detection, in particular to a method and system for non-destructive testing of sample surface coatings based on the skin effect. Background technique [0002] Metal surface coating is an important method to improve its chemical, mechanical, electrical and other properties. Among them, iron and steel and other ferromagnetic materials are plated with non-ferromagnetic metals such as zinc, chromium, tin, copper, aluminum, etc., which can be used to improve corrosion resistance, prolong service life, improve decorative effects, reduce product costs, improve electrical conductivity, improve welding performance, Improving the matching of mechanical and thermal parameters between components has a wide range of important applications. Therefore, the coating thickness and quality may be related to product performance, cost, service life, and even product safety. How to accurately and reliably measure the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04G01N27/00G01B7/06
CPCG01B7/06G01N27/00G01N27/041
Inventor 杨勇杨远聪杨文璐杨一萌安虹宇宋俊磊
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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