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Monitoring fatigue cracks of a metal structure using an eddy current sensor

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Figure

Fig. 1 TRECSCAN system. a TRECSCAN® probe. b TRECSCAN® imaging
Fig. 4 Grating eddy current micro displacement sensor and smart washer
Fig. 5 Magnetic field is disturbed as the crack initiates and propagates (schematic diagram)
Fig. 7 Change curve of amplitude ratio signal with load frequency. a Stainless steel. b Aluminum
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