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Eddy current detection uplift shake compensation method

A technology of eddy current detection and compensation method, applied in the direction of measurement device, electromagnetic measurement device, electromagnetic/magnetic thickness measurement, etc., can solve the problem of lack of compensation function and so on

Inactive Publication Date: 2017-02-15
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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Problems solved by technology

[0004] Although the multi-frequency eddy current method has two or more excitation frequencies, it only linearly synthesizes multiple detection signals for frequency mixing to suppress one or more interference effects, and has no compensation function

Method used

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  • Eddy current detection uplift shake compensation method
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  • Eddy current detection uplift shake compensation method

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no. 1 example

[0016] The first embodiment, such as figure 1 , figure 2 As shown, an eddy current detection lift-off shake compensation method, the eddy current detector 1 uses the main detection excitation signal and the auxiliary excitation signal to simultaneously excite the same eddy current detection coil 2, wherein the main detection excitation signal excites the eddy current detection coil 2 to detect defects in the weld 3 , the auxiliary excitation signal excites the eddy current detection coil 2 to detect the lift-off or shaking of the eddy current detection coil 2, the eddy current detector 1 sets the effective detection lift-off shaking signal threshold T, and the effective detection lift-off shaking signal threshold T is determined according to the detection sensitivity; When the eddy current detection coil 2 scans the weld 3, when there is lift-off or shaking, the main detection excitation signal excites the eddy current detection coil 2 to detect the defect signal A of the wel...

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Abstract

The invention discloses an eddy current detection uplift shake compensation method. An eddy current detector employs time-sharing switching of a main check excitation signal and an auxiliary excitation signal to excite an eddy current detection coil, the auxiliary excitation signal monitors the uplift or shake change of the eddy current detection coil, through a set effective detection uplift shake signal threshold, missing detection or false detection caused by eddy current detection coil uplift or shake change can be effectively solved, and further, the auxiliary excitation signal monitors the uplift change of the eddy current detection coil, so that defect signals can be corrected and compensated in real time.

Description

[0001] Technical field [0002] The invention relates to a non-destructive testing method, in particular to a method for compensating lift-off sway in eddy current testing. Background technique [0003] The eddy current flaw detection of the equipment in use will affect the eddy current detection effect if the surface condition is not good, such as coating or oxide layer, roughness change, etc., resulting in missed or false detection. For example, in the eddy current detection of metal material weld defects, due to the rough surface of the weld, the eddy current detection coil will have different degrees of lift-off or shaking during the scanning process. When the lift-off or shake exceeds a certain limit, missed detection or false detection will occur. sentenced. For a ferromagnetic material, the thickness of the surface paint layer varies by 1-2mm, and the flaw detection sensitivity requires detection of a standard flaw depth of 0.5mm. Existing technologies will produce om...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90G01B7/06
CPCG01N27/90G01B7/105
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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