Laser Doppler diagnostics of the human capillary blood stream system near skin surface

The measurements of parameters of the human capillary blood stream system, being an important for a medical diagnostics, are carried out by a laser Doppler flowmetry. Both the velocity spectrum and the restored phase portraits for movement of the blood in capillaries have been obtained. The detected signal shows the developing of chaotic regimes. The physical and mathematical modeling and also the computer simulation analysis for capillaries near the surface of human skin, verify the existence of irregular signal in a laser Doppler approach in contrast with a traditional approach based on consideration of only the size of capillaries, the average velocity and the viscosity value for blood current that results in laminar character of the flow. The dependences for the velocity distribution on both topology in space and control parameters in blood stream were measured, and characteristic Fourier-spectra are recognized for different dynamic modes. The nonlinear dynamics approach for hydrodynamic flow has been used to explain the obtained results