OPTICAL, NONINVASIVE, IN-VIVO MEASUREMENT OF PROPERTIES OF A CONSTITUENT OF A HUMAN OR ANIMAL BODY

摘要

Light of different wavelengths is introduced into a part of the body of a human or an animal, pulsatile fluctuations in the intensity of the light which has propagated through the body are measured. Intensities of light which has propagated through the body and leaves the body at different distance ranges from an entry area are measured for each of at least two wavelengths. From the light intensities estimates of properties of tissue and/or blood are calculated taking into account optical properties of the tissue and the blood influencing the intensities of light leaving the body. The method can for example be applied in pulse oximetry. A device, a probe (2) and a driver/processor (1) for use in the method according to the invention are also described.