An analysis of laser light fluctuations may indicate a state of a bloodery. In the study spectral characteristics of a dynamic speckle field scattered by skin with different microcirculation are investigated in detail. Among them: a power of fluctuations, a ratio of spectral amplitudes for two different harmonics, an average frequency of fluctuations, a spectral width and so on. A variation of these parameters during blood flow changing are discussed. An real time algorithm is used to get a map of microcirculation.
Igor V. Markhvida,
Ludmila V. Chvyaleva,
"Information parameters in blood flow specklometry", Proc. SPIE 2393, Ophthalmic Technologies V, (22 May 1995); doi: 10.1117/12.209851; https://doi.org/10.1117/12.209851