Восстановление спектра колебаний кровотока из спектра колебаний температуры пальцев рук, дисперсия температурного сигнала в биоткани

Possibilities of the finger blood flow spectrum restoration through the analysis of the temperature oscillations have been investigated. Temperature measurements have been performed by dynamic thermography method; blood flow has been estimated from the envelope of the photoplethysmography pulse waves. Model, established the blood flow and the temperature oscillations relationships, has been used to restoration of the blood flow oscillations spectrum. Time-frequency spectral decomposition was carried out by means of the wavelet analysis, using the Morlet wavelet function. As a result of investigation, it was established that viewed method of the blood flow spectrum restoration allows to monitor of the blood flow oscillations in endothelial (0.005-0.02 Hz) as well as in neurogenic (0.02-0.05 Hz) frequency band. Velocity of propagation of the temperature signal in a biotissue increased with the frequency, i.e. it is appears dispersion of the thermal wave. Presented results create the basis of the non-contact temperature methods of the skin blood flow estimation.