The paths of dislocations in wave pulses: an experimental test
- 21 February 1986
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 19 (3) , 375-383
- https://doi.org/10.1088/0305-4470/19/3/019
Abstract
Pulsed wavefields contain moving lines, called wave dislocations, where the amplitude is zero. As the lines move they sweep out surfaces called dislocation trajectories. The authors describe an experiment with ultrasound designed to test the theoretical prediction of Wright and Nye (1982) that, for small bandwidth, the trajectories are close to parts of frequency minimum surfaces. That is, surfaces on which the corresponding continuous-wave amplitude pattern has a minimum with respect to changes in frequency. 'Close' here means to second order in the bandwidth, and the prediction is indeed confirmed to this accuracy.Keywords
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