A laser probe measurement of cavitation bubble dynamics improved by shock wave detection and compared to shadow photography

Rok Petkovsek; Peter Gregorcic

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A laser probe measurement of cavitation bubble dynamics improved by shock wave detection and compared to shadow photography

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摘要

High-intensity light from a laser pulse can produce optical breakdown in a liquid, followed by ashock wave and the growth of a cavitation bubble. When the bubble reaches its maximum radius the liquid pressure causes it to collapse, which in turn initiates the growth of another bubble. The oscillations can repeat themselves several times, and a shock wave is emitted after every collapse. In our study the breakdown was induced in distilled water by a Nd:YAG pulsed laser, which was designed for ocular photodisruption. The main focus of our experiments was measurement of the cavitation bubble and the shock waves using an optical probe based on deflections of a laser beam. The applied experimental setup made it possible to carry out one- or two-dimensional scanning of the cavitation bubble based on automatic control of the experiment. Since the beam-deflection probe (BDP) allowed simultaneous measurements of the cavitation bubble and the shock waves, we developed a method for reducing the measurement noise of the BDP scanning. This improvement includes an analysis of the secondary shock waves and leads to a significant reduction in the noise of the measurement. Simultaneous measurements based on shadow photography were used as a comparative method during the experiment.

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来源
《Journal of Applied Physics》 |2007年第4期|044909-1-044909-9-0|共9页
作者
Rok Petkovsek; Peter Gregorcic;
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作者单位

Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类应用物理学;计量学;
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A laser probe measurement of cavitation bubble dynamics improved by shock wave detection and compared to shadow photography

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