Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
J Acoust Soc Am. 2011 Aug;130(2):EL87-93. doi: 10.1121/1.3609920.
Lithotripter shock waves (SWs) generated in non-degassed water at 0.5 and 2 Hz pulse repetition frequency (PRF) were characterized using a fiber-optic hydrophone. High-speed imaging captured the inertial growth-collapse-rebound cycle of cavitation bubbles, and continuous recording with a 60 fps camcorder was used to track bubble proliferation over successive SWs. Microbubbles that seeded the generation of bubble clouds formed by the breakup of cavitation jets and by bubble collapse following rebound. Microbubbles that persisted long enough served as cavitation nuclei for subsequent SWs, as such bubble clouds were enhanced at fast PRF. Visual tracking suggests that bubble clouds can originate from single bubbles.
采用光纤水听器对非除气水中在 0.5 和 2 Hz 脉冲重复频率（PRF）下产生的碎石冲击波（SW）进行了特性描述。高速成像捕获了空化气泡的惯性生长-坍塌-反弹循环，使用 60 fps 的摄像机连续记录以跟踪连续 SW 下的气泡增殖。微泡引发了空化射流破裂和反弹后气泡坍塌产生的气泡云的形成。持续足够长时间的微泡可用作后续 SW 的空化核，因此这种气泡云在快速 PRF 下得到增强。视觉跟踪表明，气泡云可以源自单个气泡。
