The article analyzes the possibility of using laser polarimetry methods to determine the possible influence of ethyl alcohol in the body of the deceased on the change in the structure of the polycrystalline films of the cerebrospinal fluid. The efficiency of usage laser polarimetry methods (determination of complex degree of mutual polarization and autofluorescence of polycrystalline films of cerebrospinal fluid) have been proved.
Relationships between the distribution of the intensity of the fluorescence of polycrystalline films of the cerebrospinal fluid of the cadavers as a result of cardiovascular pathology in the presence and absence of ethyl alcohol in the organism and the values and ranges of the change of statistical moments of the 1st - 4th orders that characterize such autofluorescence images are investigated. A good level of balanced differentiation of the presence of ethyl alcohol in the human body in the «green-yellow» and «red» sections of the spectrum has been achieved. There is a statistically significant difference between cases of death from cardiovascular disease in the presence and absence of ethyl alcohol in an organism by determining the magnitude of the statistical moment of the 4th order, which characterizes the distributions of the azimuth magnitude of the polarization of microscopic images of laser-induced fluorescence.
On this basis, an excellent balanced accuracy of the differentiation of the presence of ethyl alcohol in the human body (Ac (M4) = 94%) has been achieved. Consequently, ethyl alcohol affects the structure of polycrystalline films of cerebrospinal fluid, which should be taken into account when time since death estimated using methods of laser polarimetry.
Determination of the aerosol disperse composition by a laser particle analyzer with Gaussian distribution of the light beam intensity