Patent ID: 7725145

Claim:
A biological photometric device comprising: a light irradiating unit for irradiating light having a predetermined wavelength and responding to oxygenated hemoglobin and deoxygenated hemoglobin, to an object to be examined via irradiating optical fibers; a light detecting unit for detecting and amplifying the light passed through the object via detecting optical fibers; a signal processing unit for calculating hemoglobin time variation information of oxygenated hemoglobin, deoxygenated hemoglobin and total hemoglobin in the body of the object from the signals detected by the light detecting unit, which has noise detecting means for determining and detecting from the time variation information at least one type of a noise attributed to the existence of obstructions to the passing of light between the object and end surface of the optical fibers, and the noise attributed to damage of the light irradiating unit; and a display unit for displaying the noise signals determined and detected by the signal processing unit, in a way capable of discriminating the type of noise.