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

Sensors

Jiang Xu¹  Xinjun Wu²  Cheng Cheng² 

[1] State Engineering Research Center of Manufacturing Equipment Digitization, Huazhong University of Science and Technology, Wuhan 430074, China;

关键词: hybrid transducer;    magnetic flux leakage testing;    guided wave;    magnetostrictive effect;    bridge cable;    nondestructive testing;   

DOI  :  10.3390/s120100518

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland