Abstract
The possibility of using the laser optoacoustic method for studying spatial inhomogeneities of the optical properties of colloidal solutions is demonstrated. The proposed method for obtaining spatial distributions of the light extinction coefficient in the studied medium is based on the dependence of the time profile of the excited optical-acoustic signal on the absorption and light scattering coefficients in this medium. The solutions are ferromagnetic fluids based on water and kerosene with different volume concentrations of magnetite particles. The diagnostics of the optical properties of these ferromagnetic fluids has been carried out with high spatial resolution. It is shown that in a near-surface layer with a thickness of tens or hundreds of microns, the light extinction coefficient increases with the fluid depth. A nonlinear dependence of the light extinction coefficient on the liquid concentration at depths of more than 200 microns is found. The relative change in the light extinction with depth depends on the concentration of magnetite particles and the properties of the carrier liquid, as well as on the type of acoustic boundary.
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