Photon trajectories in a strongly scattering medium illuminated with sinusoidally modulated laser radiation

The effect of the shape of a strongly scattering object on the propagation of light from a sinusoidally modulated source is studied. In an experiment made for objects having the shape of a half space, plane layer, rectangular sector, and cylinder, mean photon trajectories and the boundaries of the r egion of twofold attenuation of the sensitivity of the output signal to the presence of a tentative inhomogeneity displaced from the mean trajectory a re determined. It is clearly shown that it is possible to approximate the m ean photon trajectory from a source to a detector by a three-stage broken l ine, like in the case of an instantaneous source described by us earlier. T he present study is required for the construction of an algorithm making it possible to carry out tomographic reconstruction in the optical region, wi th the aid of fast rectilinear projection algorithms in real time, without loss of quality.