Pulse oximeter and sensor optimized for low saturation

A pulse oximeter sensor (410), a around the lower oxygen saturation optimization of the greatest the decelerator artificial disturbing force light source. Adopts a belt, and a red red light source (112) and infrared source (114), at red light source (112) vapour the length of 700-790nm. The infrared source (114) is provided with with a high saturation patient with the technical same vapour wave length. Sensor of the invention further through a photo tube (112 and 114) is of the measuring is smallest to realize the optimization around the sensitivity of artificial perturbation with a light detector (116) are spaced. The wave optimization length of the invention is applies is made at the red light source and infrared source absorption coefficient is closer with the scattering of product consistently. The pair of optimized processing handle, wherein in the phenomena, wherein such as and the component of the power and oxygen saturation sides of the one thereof is more 2-4.