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The Research on the Pulsed Eddy Current Detecting Experimental System

Author: XuChenZuo
Tutor: ZuoPeiWen
School: Shanghai Jiaotong University
Course: Measuring Technology and Instruments
Keywords: Pulsed Eddy Current Metal defect Voltage peak Peak time Characteristic quantities Quantitative detection
CLC: TH878
Type: Master's thesis
Year: 2009
Downloads: 286
Quote: 6
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Abstract


Pulsed eddy current technology is a new type of non-destructive testing technology is a new field of application of eddy current testing . It is used to a certain share of wideband pulse signals as the excitation signal , can get rich wideband detection information , and thus has the potential advantages of the application , especially in the middle layer of the results of the multi-layer metal or subsurface quantitative detection and evaluation . The detection techniques using the feature amount and the response signal waveform detection and quantitative analysis of the defect . The paper developed pulsed eddy current experimental system consists of hardware and software design . Pulsed eddy current principle of their theory on the basis of design and a complete set of hardware experimental platform and software analysis platform . Hardware, including the design of the probe ; coil driver circuit ; signal conditioning circuit ; data acquisition circuit ; design to be tested . The excitation signal is generated by the microcontroller . Hall element on the comparison of various sensing element , the probe as its detection sensor , the software part includes Magnet finite element analysis software emulation probe work , the magnetic field distribution in the surrounding space , the design of the probe reference. Matlab software acquisition signal analysis and processing , signal filtering and denoising by wavelet transform , the final test piece defects characteristic quantities such as voltage peak and peak time . VC and Matlab combine to achieve real-time detection of metal defects . Amount of extracted features classification identification and quantitative detection of metal defects ; assay by a large number of experiments , the experimental results and theoretical analysis to verify the correctness and validity of the method used in this paper . Finally, a summary of the entire paper , and further work prospects .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Material testing machine and test equipment > Nondestructive flaw detector
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