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Proceedings Paper

Investigation Of Very Short Cavitation Shock Waves By Coherent Optical Methods
Author(s): Klaus Hinsch; Ernst Brinkmeyer
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Paper Abstract

During the collapse of cavitation bubbles in fluids very short and intense shock waves are radiated. Their study is of interest since they contain information about the final collapse phase which is very difficult to record directly. Furthermore, the shock pulses may contribute to the material damage associated with cavitation. Special optical methods taking advantage of the coherence and intensity of laser light have been developed to gain essential data about the shock waves like pulse width and maximum pressure. In one method, classical techniques of observing phase objects like Schlieren or dark-ground are modified in such a way that the accordingly filtered image of the travelling shock wave is scanned by a small pinhole of 5 pm diameter in front of a photomultiplier. In a second method the far-field diffraction pattern produced by the shock wave is recorded photographically. Since this pattern, which is the spatial power spectrum of the shock wave, is independent of the position of the wave, exposure times may be much longer than those required in direct observation of the wave due to its fast propagation. Results of both methods agree rather well and yield pulse widths of the order of lo nsec and pressure amplitudes of some 5o atm referred to 1 mm distance from the center of collapse.

Paper Details

Date Published: 14 September 1977
PDF: 6 pages
Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977); doi: 10.1117/12.955210
Show Author Affiliations
Klaus Hinsch, Universitk Gottingen (Germany)
Ernst Brinkmeyer, Universitat Gottingen (Germany)

Published in SPIE Proceedings Vol. 0097:
12th Intl Congress on High Speed Photography
Martin C. Richardson, Editor(s)

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