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.
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Sokolovskaya, Y.G., Podymova, N.B. & Karabutov, A.A. Laser Optoacoustic Study of the Structural Inhomogeneity of a Magnetic Fluid by Reconstruction of the Spatial Distribution of the Light Extinction Coefficient. Acoust. Phys. 66, 268–276 (2020). https://doi.org/10.1134/S1063771020030069
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DOI: https://doi.org/10.1134/S1063771020030069