CAVITATION THRESHOLD MEASUREMENTS FOR MICROSECOND LENGTH PULSES OF ULTRASOUND
CAVITATION THRESHOLD MEASUREMENTS FOR MICROSECOND LENGTH PULSES OF ULTRASOUND
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DOI：
10.1121/1.396347
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发表时间：
1988-06-01
影响因子：
2.4
通讯作者：
CRUM, LA
中科院分区：
文献类型：
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作者：
FOWLKES, JB;CRUM, LA
在兆赫频率下测量了水溶液的声空化阈值，作为这些量的各种组合的脉冲宽度和脉冲重复频率的函数。待测流体为0.1M pH 10.9的KOH-H3BO3缓冲液，含鲁米诺，氩气饱和，过滤至25 μ m。空化现象的存在是由光电倍增管检测到的，该光电倍增管要求发射比预设标准更大的、持续时间更长的可见光。结果表明，脉冲条件下水的空化阈值在脉冲宽度固定、脉冲重复频率增加和脉冲重复频率固定、脉冲宽度增加时均有所降低。在水溶液中测量的声空化阈值明显小于目前在医学中广泛使用的仪器相关的声压。
The acoustic cavitation threshold of an aqueous solution has been measured at megahertz frequencies as a function of pulse width and pulse repetition frequency for various combinations of these quantities. The fluid tested was a 0.1M KOH-H3BO3 buffer solution with pH 10.9, which contained luminol, was saturated with argon, and filtered to 25 .mu.. The presence of cavitation was detected by a photomultiplier tube that required the emission of visible light that was both larger in magnitude and longer in duration than a preset criterion. It was observed that the cavitation threshold of water under pulse conditions decreases both when the pulse width is fixed and the pulse repetition frequency is increased, and when the pulse repetition frequency is fixed and the pulse width is increased. Acoustic cavitation thresholds measured in aqueous solutions are significantly less than those acoustic pressures associated with instruments that are currently in widespread use in medicine.