Electromagnetic generation of electronically steered ultrasonic bulk waves
- 1 May 1976
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 47 (5) , 2225-2227
- https://doi.org/10.1063/1.322872
Abstract
The frequency dependence of the propagation direction of ultrasonic shear and longitudinal waves generated by a meander‐line electromagnetic transducer (EMAT) at MHz frequencies has been determined. The results are found to agree well with theory and demonstrate that electronic beam steering is possible using EMAT’s. The relative efficiency of generation in aluminum was also studied and, for a specific meander‐line geometry with a permanent magnet providing the necessary static magnetic field, it was found to be relatively flat versus frequency. Efficiency for shear‐wave generation (frequency range, 5–9 MHz) was about 4 dB per conversion less than the Rayleigh‐wave generation efficiency at 4.6 MHz, and for longitudinal waves (frequency range, 10–24 MHz) about 10 dB less.This publication has 3 references indexed in Scilit:
- Electromagnetic generation of Rayleigh waves at MHz frequenciesReview of Scientific Instruments, 1975
- The Generation and Propagation of Acoustic Surface Waves at Microwave FrequenciesIEEE Transactions on Microwave Theory and Techniques, 1969
- Helicon excitation of acoustic waves in aluminiumPhysics Letters A, 1967