Abstract

It has been shown that the laser optico-acoustic method can be used to study time variations in the light extinction coefficient of magnetic fluids. Diluted aqueous magnetic fluids with different concentrations of magnetite particles have been used as the objects of investigation. The dependence of the time shape of the leading edge of the optico-acoustic signal excited in an examined fluid on its optical properties enables one to measure the light extinction coefficient and restore its spatial distribution over the fluid depth. It has been experimentally shown that the light extinction coefficient of a diluted magnetic fluid decreases with time due to structural changes occurring in the fluid.

中文翻译：

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稀释磁流体中光消光的空间不均匀性及其时间变化的光声方法

摘要

已经表明，激光声光方法可用于研究磁性流体的消光系数的时间变化。具有不同浓度的磁铁矿颗粒的稀释的含水磁流体已被用作研究的对象。在被检查流体中激发的光声信号的前沿的时间形状对它的光学特性的依赖性使得人们能够测量消光系数并恢复其在流体深度上的空间分布。实验已经表明，由于在流体中发生的结构变化，稀释的磁性流体的消光系数随时间减小。