Lamb wave signal selective enhancement by an improved design of meander-coil electromagnetic acoustic transducer

2018 ◽  
Vol 27 (8) ◽  
pp. 084301
Author(s):  
Wen-Xiu Sun ◽  
Guo-Qiang Liu ◽  
Hui Xia ◽  
Zheng-Wu Xia
Keyword(s):  
Lamb Wave ◽  
Electromagnetic Acoustic Transducer ◽  
Wave Signal ◽  
Acoustic Transducer ◽  
Improved Design ◽  
Selective Enhancement

An improved design of shear horizontal guided wave electromagnetic acoustic transducer

2020 ◽  
Vol 62 (8) ◽  
pp. 494-497
Author(s):  
Xu Zhang ◽  
Sheng Feng ◽  
Jun Tu ◽  
Xiaochun Song
Keyword(s):  
Guided Waves ◽  
Cost Effective ◽  
Guided Wave ◽  
Experimental Investigations ◽  
Electromagnetic Acoustic Transducer ◽  
Rectangular Array ◽  
Acoustic Transducers ◽  
Acoustic Transducer ◽  
Improved Design ◽  
Shear Horizontal

This work proposes the use of a Halbach magnet structure to enhance the generation efficiency of shear horizontal (SH) guided waves on a plate. SH waves are normally generated using periodic permanent magnet (PPM) electromagnetic acoustic transducers (EMATs). Two PPM configurations are designed using a Halbach magnet array and the enhancements of the static magnetic fields of the two magnet arrays are validated by the finite element method, indicating that these configurations can increase the peak flux density compared with the conventional configuration. Numerical analysis and experimental investigations indicate that a racetrack coil combined with either a rectangular or triangular Halbach magnet array can enhance the amplitude of the SH guided wave by factors of ∼1.2 and ∼1.1, respectively, and that the rectangular array performs better and is more cost effective.

scholarly journals Design of Electromagnetic Acoustic Transducer for Helical Lamb Wave With Concentrated Beam

2020 ◽  
Vol 20 (12) ◽  
pp. 6305-6313 ◽  
Author(s):  
Zhe Wang ◽  
Songling Huang ◽  
Shen Wang ◽  
Qing Wang ◽  
Wei Zhao
Keyword(s):  
Lamb Wave ◽  
Electromagnetic Acoustic Transducer ◽  
Acoustic Transducer
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