Abstract

A method for analyzing the structural inhomogeneity and optical properties of colloids is experimentally realized. The method uses the dependence of the time profile of the optoacoustic signal excited in the studied medium on the light absorption and extinction coefficients in this medium. As the tested colloid solutions, water- and kerosene-based magnetic fluids with a volume magnetite concentration of 0.35–3.5% were studied. The increase in the extinction coefficient in magnetic fluids by the increase in depth was observed. The relative variation in the extinction coefficient depends on the concentration of magnetite particles, properties of the carrier fluid, and the acoustic boundary type. The relationship between the particle concentration and optical properties of the magnetic fluid allows this method to be used for determining the volume concentration of magnetite in the fluid.

中文翻译：

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通过重建消光系数的空间分布来研究磁性流体的结构不均匀性的激光光声

摘要

实验上实现了一种分析胶体结构不均匀性和光学性质的方法。该方法利用了在研究的介质中激发的光声信号的时间分布对这种介质中光吸收和消光系数的依赖性。作为测试的胶体溶液，研究了体积磁铁矿浓度为0.35-3.5％的水基和煤油基磁流体。观察到磁性流体的消光系数随着深度的增加而增加。消光系数的相对变化取决于磁铁矿颗粒的浓度，载液的性质和声边界类型。