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Proceedings Paper

Study Of Wavefronts In Acoustic Diffraction Patterns Using A Stroboscopic Schlieren Technique
Author(s): D. R. Andrews
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Paper Abstract

Ultrasonic waves in water (wavelength 2.00 ±0.01 mm) were generated in packets of approximately 15 wavefronts at repetition rates in the range 200 - 2000 Hz. They were rendered visible using a 'Z' configuration schlieren system and a stroboscopic light source driven at the same repetition frequency. The light source was a GaAsP light-emitting diode cooled to a temperature of approximately 80 K producing light flashes of variable duration (50 -200 ns). Various obstacles were placed in the path of the waves: cylinders, an acoustic diffraction grating, and a reflecting surface of variable geometry. The behaviour of the wavefronts in the vicinity of the obstacles and in their diffraction patterns were examined. Certain diffraction amplitude zeros are shown to be lines of anomalous phase or wavefront dislocations. Dislocations have also been located in the caustic cusp focus from reflecting surfaces; a result which is in good agreement with catastrophe theory.

Paper Details

Date Published: 1 March 1983
PDF: 6 pages
Proc. SPIE 0348, 15th Intl Congress on High Speed Photography and Photonics, (1 March 1983); doi: 10.1117/12.967799
Show Author Affiliations
D. R. Andrews, University of Cambridge (England)

Published in SPIE Proceedings Vol. 0348:
15th Intl Congress on High Speed Photography and Photonics
Lincoln L. Endelman, Editor(s)

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