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Pulsed eddy-current-based metal plate thickness information detection method

A technology of information detection and pulsed eddy current, applied in the direction of electric/magnetic thickness measurement, electromagnetic measurement device, etc., can solve the problem of not being able to achieve good results, and achieve the effect of optimizing the barrier of dependence, improving the timeliness, and simplifying the experimental method.

Active Publication Date: 2018-05-04
四川元匠科技有限公司
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Problems solved by technology

However, for ultra-thin metal sheets, ultrasonic testing cannot achieve good results

Method used

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  • Pulsed eddy-current-based metal plate thickness information detection method
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  • Pulsed eddy-current-based metal plate thickness information detection method

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Embodiment Construction

[0042] Further describe the technical scheme of the present invention in detail below in conjunction with accompanying drawing:

[0043] The theoretical technology of pulsed eddy current testing technology (PECT) in this embodiment is electromagnetic field theory and eddy current effect. The main process is: a square wave (equivalent to a pulse) excitation current signal is generated by the excitation coil, thereby generating a pulsed magnetic field signal (time-varying signal) in space; due to the excitation of the pulsed magnetic field, a pulsed eddy current signal is formed in the material , the eddy current signal also generates an induced magnetic field in space; the combined magnetic field signal of the two magnetic fields is detected by the HALL sensor in the probe as a detection signal; this signal, as a carrier carrying information on the thickness (defect depth) of the test piece, will be used as a data Source to analyze, so as to solve the specific size of the thick...

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Abstract

The invention discloses a pulsed eddy-current-based metal plate thickness information detection method. The method comprises the following steps of S1, testing the magnetic induction intensity Bair inthe air by means of a probe; S2, measuring the magnetic induction intensity Bref of a standard test piece of the same material as a tested piece and adopting the measured result as a reference signal; S3, detecting the test piece of the same standard material and obtaining a parameter (imgfile = 'DDA 00014861076800000000011.TIF 'wi = '155 'he = '70 '); S4, determining a constant C, and calculating a characteristic parameter KB value; S5, calculating the value of the frequency f of the corresponding KB value by calculating a formula of the characteristic parameter KB value and an additional formula in the step S4; S6, taking the frequency f, the constant C and the parameter (img file = 'DDA 00014861076800000000012. tif'wi = '131 'he = '70 ') into the formula, and calculating to obtain thethickness value h of the tested piece. By adopting the method, the eddy current accurate detection is realized through eddy current signal coupling and eddy current signal decoupling. Meanwhile, the experiment method is simplified, and the research timeliness is improved.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a method for detecting thickness information of metal plates based on pulsed eddy current. Background technique [0002] With the rapid development of various material sciences, aerospace materials are constantly updated. Due to this particularity, while obtaining convenience, it also puts forward higher requirements for defect detection. For aircraft operating at high altitudes, any small quality hazard or design defect will bring immeasurable safety hazards, and even cause major loss of life and property. In the history of aerospace, there are countless examples of major safety accidents caused by small errors and defects. Therefore, since the beginning of aerospace, scientists have been looking for a detection method that can detect and measure hidden safety hazards, in the hope that the material properties and structural state of the aircraft can be tested without dam...

Claims

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Application Information

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IPC IPC(8): G01B7/06
Inventor 郑德生田露露李晓瑜
Owner 四川元匠科技有限公司
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