Optika Atmosfery i Okeana Journal

Vol. 18, issue 01-02, article # 15

Budnev N. M., Kokhanenko G. P., Krekova M. M., Mirgazov R. R., Penner I. E., Tarashchanskii B. A., Shamanaev V. S. Measurements of hydrosol scattering asymmetry by use of light field from a point source. // Atmospheric and oceanic optics. 2005. V. 18. No. 01-02. P. 96-104. PDF
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Abstract:

A method for measuring the asymmetry of the hydrosol scattering phase function from the ratio of irradiance generated by two sources with hemispherical direction patterns is analyzed. The method proposed was realized in ASP-15 device, installed at the place of location of the NT-200 neutrino telescope (Lake Baikal region) and measuring the optical parameters of water in the wavelength range from 350 to 690 nm. Numerical simulation of light fields by the Monte Carlo method was carried out. It is shown that, using the appropriate corrections allowing for the values of the absorption and scattering coefficients of the medium, it is possible to determine the asymmetry factor with the acceptable accuracy. A hypothesis is put forward that the real and imaginary parts of the refractive index within the chlorophyll absorption line vary in phase. This hypothesis can explain the experimentally observed decrease of the asymmetry in the range of 650-690 nm.