A pulse oximeter related. The pulse oximeter includes a light source configured to emit detecting light a light acquirer spaced from the light source and so that the detecting light can get the light acquirer after passing through the objector a processor connected to the light acquirer and a filter located on the light path from the light source to the light acquirer and including a first band filter having center wavelength of 660nm and a second band filter having center wavelength of 940nm. The filter further includes a controller configured to control the first band filter and the second band filter, so that the first band filter and the second band can be located on the light path from the light source to the light acquirer alternately. The filter can filter the unnecessary light and improve the accuracy of the pulse oximeter.一種光脈衝式血氧濃度計,其包括:一光源,所述光源用於發射檢測光;一光接收器;一處理器,所述處理器與所述光接收器電連接;以及一濾光器,所述濾光器包括一中心波長為660nm的第一單峰濾波片和一中心波長為940nm的第二單峰濾波片;其中,所述濾光器進一步包括一機械裝置;所述機械裝置用於控制所述第一單峰濾波片和第二單峰濾波片,從而使所述第一單峰濾波片和第二單峰濾波片交替設置於從所述光源到所述光接收器的光路上。本發明的血氧濃度計,由於兩個單峰濾光片交替工作,使不必要波長的光無法進入光接受器,藉此可以消除雜訊,得到對比更清楚的信號,從而增加該血氧濃度計的血氧濃度計算的準確性。10B‧‧‧血氧濃度計101‧‧‧光源102‧‧‧光接收器103‧‧‧處理器104‧‧‧顯示器105‧‧‧濾光器1051‧‧‧第一單峰濾波片1052‧‧‧第二單峰濾波片106‧‧‧手指107‧‧‧第一機械裝置
