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Calculate the arterial oxygen saturation (SaO2) of the tissue by detecting the ratio of changes in the absorbance of red light and infrared light of different wavelengths (R/IR value) of hyperemia peripheral tissues such as fingers or earlobes, etc., according to Beer-Lambert law , The functional relationship between the ratio R/IR and the arterial oxygen saturation (SaO2) should be linear, but because biological tissue is a complex optical system with strong scattering, weak absorption, and anisotropy [2~4], it is not completely It conforms to the classic Beer-Lambert law, which makes it difficult to establish a mathematical model that expresses the relative changes in the absorbance of red light and infrared light (R/IR value) and the relationship between the arterial blood oxygen saturation (SaO2). The corresponding relationship between R/IR and SaO2 can only be determined by experimental methods, that is, the calibration curve.
Calculate the arterial oxygen saturation (SaO2) of the tissue by detecting the ratio of changes in the absorbance of red light and infrared light of different wavelengths (R/IR value) of hyperemia peripheral tissues such as fingers or earlobes, etc., according to Beer-Lambert law , The functional relationship between the ratio R/IR and the arterial oxygen saturation (SaO2) should be linear, but because biological tissue is a complex optical system with strong scattering, weak absorption, and anisotropy [2~4], it is not completely It conforms to the classic Beer-Lambert law, which makes it difficult to establish a mathematical model that expresses the relative changes in the absorbance of red light and infrared light (R/IR value) and the relationship between the arterial blood oxygen saturation (SaO2). The corresponding relationship between R/IR and SaO2 can only be determined by experimental methods, that is, the calibration curve.