Abstract
The electromagnetic guided wave transducer has been widely used in pipeline detection in recent years due to its non-contact energy conversion characteristics. Based on the Weidemann effect, an electromagnetic guided wave transducer that can realize the locating defect of the steel pipe was provided. Firstly, the principle of the transducer was analyzed based on the Weidemann effect. The basic structure of the transducer and the basic functions of each part were given. Secondly, the key structural parameters of the transducer were studied. Based on the size of the magnets and the coils, a protype electromagnetic guided wave transducer based on Wiedemann effect was developed. Finally, the experiments were carried out on the steel pipe with a defect using the developed transducer. The results show that the transducer can actuate and receive the T(0,1) and T(1,1) modes in the steel pipe. The axial positioning of the defect is located by moving the transducer axially. The circumferential positioning of the defect is located by rotating the transducer. Additionally, missed detection can be effectively avoided by rotating the transducer.
Highlights
Ultrasonic guided wave technology uses elastic waves propagating in a waveguide to detect defects
In order to explore the influence of the permanent magnet length of the guided wave In orderthe to explore influence of the permanent magnet length the10 guided wave transducer, magnet the length of the excitation transducer was set to 5 of mm, mm, 15 mm, transducer, the magnet length of the excitation transducer was set to mm, mm, 20 mm, 30 mm, 40 mm, 60 mm, 80 mm, 120 mm, and 160 mm
This paper provides a non-contact electromagnetic guided wave transducer based on the Wiedemann effect for pipeline inspection
Summary
Ultrasonic guided wave technology uses elastic waves propagating in a waveguide to detect defects. The energy conversion of magnetostrictive guided wave transducer is mainly based on the magnetostrictive effect of the material [14,15]. When the energy conversion process of the magnetostrictive guided wave transducer directly occurs in the ferromagnetic material, it is a non-contact transducer and can only detect the ferromagnetic material but does not require surface treatment of the member. Based on the Wiedemann effect, the torsional mode guided waves can be excited in the steel tube while avoiding the influence of the Lorentz force. The current research on the torsional mode guided wave transducer based on the Wiedemann effect mainly focuses on the contact transducer using magnetostrictive patches, which will cause surface damage if the steel pipe needs to be polished. The transducer can locate the axial position and the circumferential position of the defect in the steel pipe
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