Arvengas Arnaud, Davitt Kristina, Caupin Frédéric
Laboratoire de Physique Statistique, Ecole Normale Supérieure, UPMC Université Paris 06, Université Paris Diderot, CNRS, 24 rue Lhomond, 75005 Paris, France.
Rev Sci Instrum. 2011 Mar;82(3):034904. doi: 10.1063/1.3557420.
We use focused ultrasound bursts to submit a liquid to mechanical tension. When the pressure in the sound wave reaches a sufficiently low value, vapor bubbles are nucleated in the bulk liquid. According to nucleation theory, increasing the ultrasound frequency increases the cavitation threshold by a calculable amount. To check this, we have built a fiber optic probe hydrophone based on one originally proposed by Staudenraus and Eisenmenger [Ultrasonics 31, 267 (1993)]. We have adapted the pressure calibration and data analysis of this tool to make it appropriate for precise measurements of tension in liquids. We are able to resolve the fractional change in the pressure threshold for cavitation in water that results from a twofold increase in the frequency. This provides a test of nucleation theory in general.
我们使用聚焦超声脉冲使液体承受机械张力。当声波中的压力达到足够低的值时，大量液体中会形成蒸汽泡。根据成核理论，增加超声频率会使空化阈值以可计算的量增加。为了验证这一点，我们基于施陶登劳斯和艾森门格尔最初提出的一种方法[《超声学》31卷，267页（1993年）]构建了一个光纤探头水听器。我们对该工具的压力校准和数据分析进行了调整，使其适用于精确测量液体中的张力。我们能够分辨出频率翻倍导致的水中空化压力阈值的分数变化。这总体上为成核理论提供了一个检验。
