Synchronous Picosecond Sonoluminescence

同步皮秒声致发光

• 批准号: 9311108
• 负责人: Lawrence Crum
• 金额: $ 53.81万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-12-15 至 1998-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9311108&HistoricalAwards=false
• 关键词: Synchronous; Picosecond; Sonoluminescence

This proposal calls for the study of the process of acoustic cavitation and the accompanying emission of electromagnetic radiation. The light observed in this process is called sonoluminescence. In the process of propagating acoustic waves through a liquid containing microscopic cavitation can be violent enough to damage even hardened materials, and the effective temperature within the bubbles can reach thousands of degrees. There is a lack of knowledge of the physical and chemical processes occurring in these processes. However recent studies have produced conditions wherein a single, stable cavitation bubble is observed to generate sonoluminescence every cycle. "Temperatures" associated with these bubbles appear to reach levels near 100,000K and the electromagnetic emissions inexplicably achieve a level of synchronity that is repetitive to within a part 1011. The duration of these synchronous pulses is less that 50 ps. Several technological applications of this process have been suggested. This proposal is for the study of the basic physics of this process.

这一建议要求对声空化过程及其伴随的电磁辐射发射进行研究。在这个过程中观察到的光被称为声致发光。在声波通过含有微观空化的液体传播的过程中，其剧烈程度足以破坏硬化材料，气泡内的有效温度可达数千度。缺乏对这些过程中发生的物理和化学过程的了解。然而，最近的研究已经产生了一个条件，其中一个单一的，稳定的空化泡被观察到每个周期产生声致发光。与这些气泡相关的“温度”似乎达到了接近10万k的水平，并且电磁发射莫名其妙地达到了重复到1011分之一的同步水平。这些同步脉冲的持续时间小于50ps。已经提出了这一过程的几种技术应用。这一建议是为了研究这一过程的基本物理。