FIELD: medicine.
SUBSTANCE: group of inventions relates to medicine. A method of photoplethysmography contains a stage at which a signal, based on at least one signal from at least one sensor, made with a possibility of trapping light from a live object, is processed to separate information about a characteristic of a periodic biological phenomenon. At least, one of the signals from at least one sensor is obtained with the application of at least one light source and a filter, installed before at least one sensor, adjusted for the maximum in a water absorption spectrum.
EFFECT: group of inventions makes it possible to increase the probability of separating a relatively clear biometric signal.
10 cl, 6 dwg
