Investigation Of Very Short Cavitation Shock Waves By Coherent Optical Methods

Klaus Hinsch; Ernst Brinkmeyer

doi:10.1117/12.955210

14 September 1977 Investigation Of Very Short Cavitation Shock Waves By Coherent Optical Methods

Klaus Hinsch, Ernst Brinkmeyer

Proceedings Volume 0097, 12th Intl Congress on High Speed Photography; (1977) https://doi.org/10.1117/12.955210
Event: 12th International Congress on High Speed Photography, 1976, Toronto, Canada

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.

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Klaus Hinsch and Ernst Brinkmeyer "Investigation Of Very Short Cavitation Shock Waves By Coherent Optical Methods", Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977); https://doi.org/10.1117/12.955210

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