	US 12,228,549 B2
	Acoustic field diffusion type electromagnetic acoustic transducer with improved periodic permanent magnets
Zenghua Liu, Beijing (CN); Wenshuo Jiang, Beijing (CN); Zhaojing Lu, Beijing (CN); and Yanhong Guo, Beijing (CN)
Assigned to Beijing University of Technology, Beijing (CN)
Filed by Beijing University of Technology, Beijing (CN)
Filed on Oct. 14, 2022, as Appl. No. 17/966,175.
Claims priority of application No. 202210352556.1 (CN), filed on Apr. 5, 2022.
Prior Publication US 2023/0314385 A1, Oct. 5, 2023
Int. Cl. G01N 29/24 (2006.01); G01N 29/04 (2006.01); G01N 33/2045 (2019.01)

CPC G01N 29/24 (2013.01) [G01N 29/04 (2013.01); G01N 33/2045 (2019.01); G01N 2291/0234 (2013.01); G01N 2291/0289 (2013.01); G01N 2291/101 (2013.01)]

4 Claims

1. An acoustic field diffusion type electromagnetic acoustic transducer with improved periodic permanent magnets, comprising:

a plurality of groups of periodic permanent magnets,

a transducer framework, and

improved racetrack shaped coils and a transducer connector;

wherein each group of the plurality of groups of periodic permanent magnets is arranged in a corresponding one of grooves of the transducer framework, a predetermined inclined angle is formed between every two adjacent grooves of the grooves, the improved racetrack shaped coils are arranged right below the transducer framework and are connected with the transducer connector, each of the improved racetrack shaped coils corresponds to a corresponding one group of the plurality of groups of periodic permanent magnets, and the transducer connector is fixed on the transducer framework; and

wherein a width of a magnet of the plurality of groups of periodic permanent magnets is equal to half of a wavelength of targeted excited guided waves of shear horizontal mode SH₀.