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Zones of influence on the laser Doppler anemometer signal from a model turbid medium

Laser doppler probing of moving matter is an effective noninvasive technique for velocity field profiling. For this, quality laser doppler anemometers (LDA) are widely used for the diagnostics of spatially distributed flows. When applied to transparent media, high spatial resolution of the LDA is attainable by forming very small probe volumes at the focus of the probing laser beam(s). In highly scattering media, such as biological tissues, laser radiation propagates in the course of multiple scattering events. As no focusing is possible, the shape, size, and location of the probe volume appear uncertain. In our study on Monte Carlo computer simulated experiments we sought to reveal spatial patterns in LDA doppler spectrum formation. We applied a model of semi-infinite turbid medium to simulate experiments with biological materials at the backscattering detection mode. The medium contained similar light scattering particles, a certain portion of those regarded as moving. The scattering properties of the particles were chosen roughly similar to those of red blood cells.