Flexible magnetoresistive sensor for eddy current non-destructive testing
In order to study the difference of planar probe and curved probe in detecting planar and curved defects,printed circuit board(PCB)is used for rigid probe design and flexible printed circuit board(FPC)is used for flexible probe design.Experimental results indicate that the signal-to-noise ratio(SNR)of the rigid probe is 30.2 dB,while that of the flexible probe is 24.6 dB when tested on a flat aluminum plate.When it comes to bending defects,the SNR drops to 14.8 dB for the rigid probe and 27.1 dB for the flexible one.Considering temperature stability,SNR,price and other factors,the rigid probe is suitable for small curvature flat defect detection,and the flexible probe is suitable for curved surface detection.
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