基于布里渊散射测量海水体粘滞系数的方法研究

Measurement of Water Bulk Viscosity Based on Brillouin Scattering

水的粘度系数作为一个重要参数,在流体力学和水利建设方面有着重要的作用。光散射方法已被广泛应用于物理、化学(如高分子化学)检测及海洋监测中。其中布里渊散射就是一种重要手段。为了有效测量海水体粘滞系数,建立了一种基于布里渊散射的海水体粘滞系数的反演模型,通过测量布里渊频移、线宽以及海水盐度,可以快速反演出海水体粘滞系数。同时对该反演模型进行了精度分析,分析表明,海水盐度对海水体粘滞系数的影响最大,其次为布里渊线宽,获取较高的盐度精度是获得较高海水体粘滞系数的基础。分析结果对于激光雷达的设计具有一定的参考价值。

In order to measure water bulk viscosity effectively,of which an inversion model based on brillouin scattering is established.Through the measurement of brillouin frequency shift,line width and salinity,water bulk viscosity can be inverted quickly.At the same time,through the precision analysis of the inversion model,it shows that the impact of water salinity on bulk viscosity is the largest,the second is the impact of brillouin line width.So obtaining higher precision salinity is the measurement basis of high bulk viscosity.The results of the analysis to the design of the laser radar have a certain reference value.