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.
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[0042] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings:
[0043] The theoretical technology of the pulse eddy current detection technology (PECT) in this embodiment is the electromagnetic field theory and the eddy current effect. The main process is: the excitation coil generates a square wave (equivalent to pulse) excitation current signal, 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 is used as a carrier that carries information on the thickness of the specimen (defect depth) and will be used as data Source to analyze, so as to solve the ...
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