Non-Invasive Method and Experimental Study for Measurement of Oxygen Saturation Rate in Wide Range

This paper describes a nonlinear method of measuring the blood oxygen saturation rate (SpO₂) in wide range on the basis of spectrophotometry, uses the CAN bus communication and fast digital signal processing to implement the non-invasive pulse blood oxygen saturation monitor in wide range and introduces the components and functions of the monitor in detail. This method solves the nonlinear problem in measuring the blood oxygen saturation in wide range, improves the applying range and the precision. Besides, according to the experiments, the oxygen saturation rate can be correctly measured by the pulse oximeter we designed in the wide range of 35% to 100% within plusmn3% accuracy and the absorption coefficient of the hemoglobin is also analyzed in the discussion. The pulse oximeter based on the method can be used for patients in clinic and the cosmonauts in the field of spaceflight.