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Corrosion of steel bars in reinforced cement concrete (RCC) structures leadsto premature deterioration and increase in life cycle maintenance costs.Non-destructive testing (NDT) of incipient corrosion has been an impending taskin this domain. We present a low cost sensing platform based on eddy currentdetection using anisotropic magnetoresistive (AMR) sensor to measure the extentof corrosion in steel reinforcing bars (rebars). The scheme employsphase-sensitive detection, wherein the phase shift in the sensor output(proportional to surface conductivity of the rebar) relative to the referencestimulus is measured by a lock-in amplifier and used to distinguish corrodedand non-corroded rebars. The proof-of-concept sensor demonstration is able toresolve varying extents of rebar corrosion and can find potential applicationsas an NDT tool in a variety of industries.

Phase sensitive detection of extent of corrosion in steel reinforcing bars using eddy currents