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According to the spectroscopic characteristics of haemoglobin and oxyhaemoglobin,this paper present a new system for monitoring the arterial oxygen saturation. 根據(jù)血紅蛋白和含氧血紅蛋白的光譜特性，提出了一種監(jiān)測動(dòng)脈血氧飽和度的新系統(tǒng)。