Experimentally Probing the Unknowns of Sonoluminescence

实验探索声致发光的未知数

• 批准号: 9415494
• 负责人: Seth Putterman
• 金额: $ 30万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9415494&HistoricalAwards=false
• 关键词: Experimentally; Probing; Unknowns; Sonoluminescence

This proposal is for, "Experimentally Probing the Unknowns of Sonoluminescence". Sonoluminescence is the emission of visible radiation from cavitation bubbles of gas produced in a liquid by standing sound waves. The bubbles are trapped at nodes of the standing sound waves and at high intensity the pulsations of the bubble with pressure oscillations of the sound wave are large enough to prevent the bubble from dissolving into the surrounding liquid. At higher levels of sound, a threshold is reached at which the bubble motion abruptly switches to a state where pulsations are so enormous and nonlinear that the resulting supersonic inward collapse of the bubble concentrates the acoustic energy by over 13 orders of magnitude, so as to emit picosecond flashes of broad band light which extend well into the ultraviolet and which, furthermore, are synchronous with the sound field to picosecond accuracy. This phenomena is not understood but it has been shown to have large effects in catalyzing some chemical processing, in causing erosion of hardened metal surfaces and possibly in forming new materials.

该提案是为了“实验探索声致发光的未知数”。 声致发光是通过驻声波在液体中产生的气体空化气泡发射可见辐射。 气泡被捕获在驻声波的节点处，并且在高强度下，气泡的脉动与声波的压力振荡足够大以防止气泡溶解到周围的液体中。 在较高声级下，达到阈值时，气泡运动突然切换到脉动如此巨大且非线性的状态，导致气泡的超音速向内塌陷将声能集中超过 13 个数量级，从而发出宽带光的皮秒闪光，该闪光延伸到紫外线，而且与声场同步至皮秒 准确性。 这种现象尚不清楚，但已证明它在催化某些化学加工、引起硬化金属表面的侵蚀以及可能形成新材料方面具有巨大影响。