Sonoluminescence in Cryogenic Fluids

9312205威廉姆斯这个探索性的建议是研究流体中的同步声致发光（SSL）的性质，以获得一些基本的见解的性质的现象。虽然有证据表明气体的压缩加热足以产生可观的黑体辐射，但声音转化为光的确切机制（首先在水中的气泡中观察到）尚不清楚。然而，尚不清楚在热气体或等离子体中是否也存在可能控制发射的化学或原子过程。本文的工作主要包括三个方面：研究了球形连续波声谐振器中单个气泡的振动特性。研究气泡发出的光的强度与所施加的声场的关系。在可见光到紫外光波长范围内对发射光光谱的测量。 SSL研究将在低温液体中进行，因为这些液体比水有几个优点。它们具有高化学纯度，光谱研究可以在更宽的波长范围内进行。 这个探索性的建议是研究流体中的同步声致发光（SSL）的性质，以获得一些基本的见解的现象的性质。声音转化为光的确切机制（首先在水中的气泡中观察到）尚不清楚。有一些证据表明，气体的压缩加热足以导致辐射的发射。然而，尚不清楚在热气体或等离子体中是否也存在可能控制发射的化学或原子过程。本文的工作主要包括三个方面：研究了球形连续波声谐振器中单个气泡的振动特性。研究气泡发出的光的强度与所施加的声场的关系。在可见光到紫外光波长范围内对发射光光谱的测量。 SSL研究将在低温液体中进行，因为这些液体比水有几个优点。它们具有高化学纯度，光谱研究可以在更宽的波长范围内进行。 ***

9312205 Williams This exploratory proposal is to study the properties of synchronous sonoluminescence (SSL) in fluids in order to gain some fundamental insights into the nature of the phenomenon. The exact mechanism by which there is a conversion of sound into light (first observed in air bubbles in water) is not understood, although there is some evidence that the compressional heating of the gas is enough to yield appreciable black-body radiation. However, it is not clear whether there are also chemical or atomic processes occurring in the hot gas or plasma which may control the emission. The work in this proposal is composed of three main thrusts: The study of the oscillation properties of a single bubble trapped at the center of a spherical continuous wave acoustic resonator. The investigation of the intensity of the light emitted by the bubbles as a function of the applied acoustic fields. The measurement of the spectrum of the emitted light in the visible to ultra-violet wavelength range. The SSL research will be undertaken in cryogenic liquids as these fluids have several advantages over water. They have high chemical purity and the spectroscopic studies can be carried out over a wider wavelength range. %%% This exploratory proposal is to study the properties of synchronous sonoluminescence (SSL) in fluids in order to gain some fundamental insights into the nature of the phenomenon. The exact mechanism by which there is a conversion of sound into light (first observed in air bubbles in water) is not understood. There is some evidence that the compressional heating of the gas is enough to cause the emission of radiation. However, it is not clear whether there are also chemical or atomic processes occurring in the hot gas or plasma which may control the emission. The work in this proposal is composed of three main thrusts: The study of the oscillation properties of a single bubble trapped at the center of a spherical continuous wave acoustic resonator. The investigation of the intensity of the light emitted by the bubbles as a function of the applied acoustic fields. The measurement of the spectrum of the emitted light in the visible to ultra-violet wavelength range. The SSL research will be undertaken in cryogenic liquids as these fluids have several advantages over water. They have high chemical purity and the spectroscopic studies can be carried out over a wider wavelength range. ***