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- Title
A New Design of the Dual-Mode and Pure Longitudinal EMAT by Using a Radial-Flux-Focusing Magnet.
- Authors
Zhang, Xu; Li, Weiwen; Li, Bo; Tu, Jun; Liao, Chunhui; Wu, Qiao; Feng, Sheng; Song, Xiaochun
- Abstract
An electromagnetic acoustic transducer (EMAT) is suitable for measuring the propagation time more accurately without causing abrasion to the transducer during testing due to the principle of its excitation. This work designs a flux-concentrating EMAT with a radial-flux-focusing permanent magnet to significantly enhance static magnetic field strength. Through theoretical analysis and finite element simulation, two kinds of coils are designed according to the concentration areas of the horizontal and vertical components of the magnetic field. One is used to generate pure longitudinal waves, and the other is used to generate both longitudinal waves and shear waves. The experimental comparison shows that the amplitudes of the pure longitudinal wave and the dual-mode wave excited by the two kinds of coils with the radial-flux-focusing magnet are more than two times higher than those with the ordinary magnet. Therefore, the flux-concentrating EMAT with the appropriate coil provides an insight into realizing more accurate detection where longitudinal wave detection is required.
- Subjects
LONGITUDINAL waves; ACOUSTIC transducers; MAGNETIC flux density; MAGNETS; MECHANICAL abrasion; PERMANENT magnets; SHEAR waves
- Publication
Sensors (14248220), 2022, Vol 22, Issue 4, pN.PAG
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s22041316