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Sensors 2012, 12(1), 518-533; doi:10.3390/s120100518

A Magnetic Flux Leakage and Magnetostrictive Guided Wave Hybrid Transducer for Detecting Bridge Cables

State Engineering Research Center of Manufacturing Equipment Digitization, Huazhong University of Science and Technology, Wuhan 430074, China
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Received: 6 December 2011 / Revised: 28 December 2011 / Accepted: 30 December 2011 / Published: 5 January 2012
(This article belongs to the Section Physical Sensors)
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Abstract

Condition assessment of cables has gained considerable attention for the bridge safety. A magnetic flux leakage and magnetostrictive guided wave hybrid transducer is provided to inspect bridge cables. The similarities and differences between the two methods are investigated. The hybrid transducer for bridge cables consists of an aluminum framework, climbing modules, embedded magnetizers and a ribbon coil. The static axial magnetic field provided by the magnetizers meets the needs of the magnetic flux leakage testing and the magnetostrictive guided wave testing. The magnetizers also provide the attraction for the climbing modules. In the magnetic flux leakage testing for the free length of cable, the coil induces the axial leakage magnetic field. In the magnetostrictive guided wave testing for the anchorage zone, the coil provides a pulse high power variational magnetic field for generating guided waves; the coil induces the magnetic field variation for receiving guided waves. The experimental results show that the transducer with the corresponding inspection system could be applied to detect the broken wires in the free length and in the anchorage zone of bridge cables.
Keywords: hybrid transducer; magnetic flux leakage testing; guided wave; magnetostrictive effect; bridge cable; nondestructive testing hybrid transducer; magnetic flux leakage testing; guided wave; magnetostrictive effect; bridge cable; nondestructive testing
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MDPI and ACS Style

Xu, J.; Wu, X.; Cheng, C.; Ben, A. A Magnetic Flux Leakage and Magnetostrictive Guided Wave Hybrid Transducer for Detecting Bridge Cables. Sensors 2012, 12, 518-533.

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