Observation of self-focusing of sound
Abstract
Phenomena associated with the self-focusing of sound have been observed experimentally. The sound waves were generated by a ceramic piezoelectric transducer operating at a frequency of 1 MHz in glycerin and transformer oil. The distributions of the wave amplitude and phase in the beam cross section were measured 0, 20, and 40 seconds after the ultrasound was turned on. The specific self-focusing effects observed were: contraction of the beam; intensification of the sound at the beam axis; and a change in the curvature of the wavefront. The experimental results are interpreted within the framework of the acoustic theory of Zabolotskaya et al. (1976).
- Publication:
-
ZhETF Pisma Redaktsiiu
- Pub Date:
- May 1985
- Bibcode:
- 1985ZhPmR..41..381A
- Keywords:
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- Acoustics;
- Self Focusing;
- Sound Waves;
- Wave Propagation;
- Phase Shift;
- Piezoelectric Transducers;
- Reynolds Number;
- Acoustics