Mr. Pavel S. Grashin Profile

Pavel S. Grashin

at MV Lomonosov Moscow State Univ

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Proceedings Article | 30 May 2002 Paper

Opto-acoustic measurement of optical properties of turbid media

Alexander Karabutov, Natalia Podymova, Ivan Pelivanov, P. Grashin, Alexander Oraevsky

Proceedings Volume 4749, (2002) https://doi.org/10.1117/12.468906

KEYWORDS: Absorption, Laser scattering, Protactinium, Light scattering, Signal attenuation, Optical properties, Scattering, Particles, Monte Carlo methods, Tissues

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Time-resolved laser optoacoustic method was developed for the measurement of the spatial distribution of laser fluence rate in uniformly absorbing and scattering condensed turbid media and to determine the optical properties of such media - effective light attenuation and absorption coefficients. This method is based on detection of laser-induced acoustic transients in an investigated medium with high temporal resolution. The effective light attenuation coefficient is measured by exponential fitting of the front of optoacoustic transient. To determine the light absorption coefficient we investigated features of the spatial distribution of laser fluence rate beneath the surface of an irradiated medium. We proved both experimentally and with Monte-Carlo simulation, that the location of the maximum of laser fluence rate distribution in a turbid medium depends solely on the ratio of light absorption and effective light attenuation coefficients, if the anisotropy factor of light scattering is higher than 0.8. This dependence can be employed to calculate the light absorption coefficient of turbid media from the leading edge of laser-excited optoacoustic transients.

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