测量单泡声致发光中气泡R(t)曲线的前向Mie散射技术

光干涉原理和Mie理论计算结果表明，单泡声致发光中气泡前向Mie散射的振荡信号，主要是由于气泡的透射光束和表面反射光束之间光干涉产生的. 这些干涉波峰形成了测量气泡半径的空间标尺，标尺的单位长度δR由散射角θ，检测光波波长和流体光折射率确定，而每个波峰就是标尺的刻线，它们与该时刻的气泡半径大小一一对应. 在30°—50°散射角范围内，利用前向Mie散射实验测定了单泡声致发光中气泡的最大半径，R(t)曲线及平衡半径，表明前向Mie散射是一种便捷的测定气泡运动特性的有效方法. 关键词： 单泡声致发光 前向Mie散射 光干涉

Forward Mie scattering method applied to the measurement of the R(t) curve of single bubble sonoluminescence

In single bubble sonoluminescence (SBSL), the forward Mie scattering signal of the bubble, which is waved due to the interference between the scattered light components, provides a scale for measuring the change of the bubble radius. The unit of the scale is decided by the scattered angle θ, the optical wavelength λ, and the relative refraction index n of the fluid; and the scale marks are the peaks and valleys of forward scattered light, which correspond to specific radius values. The forward Mie scattering method has been applied in measurement of the R(t) curve, especially the maximum radius value R_max, and further in the fit of the equilibrium radius R₀ of bubble in SBSL, and is proved to be a feasible and convenient technique in the study of the bubble dynamics in SBSL.