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A Preliminary Magnetoinductive Sensor System for Real-Time Imaging of Steel Reinforcing Bars Embedded Within Concrete

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4 Author(s)
Benitez, D.S. ; Sch. of Electr. & Electron. Eng., Univ. of Manchester, Manchester ; Sung Quek ; Gaydecki, Patrick ; Torres, V.

This paper studies the feasibility of using solid-state magnetoinductive probes for detecting and imaging steel reinforcing bars embedded within prestressed and reinforced concrete. Changes in the inductance of the sensor material are directly proportional to the strength of the measured magnetic field parallel to the sensor. Using a square coil of 300 mm times 300 mm times 2.5 mm, 10-mm rebars can be imaged down up to a depth of 100 mm. Experimental results obtained by scanning steel bar specimens are presented. General performance characteristics and sensor limitations are also investigated.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:57 ,  Issue: 11 )