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. The filter includes a double band filter having center wavelengths of 660nm and 940nm. The double band 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,所述光接收器與所述光源間隔設置,從而使所述光源發射的檢測光透射被測物之後可以到達所述光接收器;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,所述濾光器設置於從所述光源到所述光接收器的光路上;其中,所述濾光器包括一雙峰濾光片,所述雙峰濾光片的中心波長分別為660nm及940nm。本發明的血氧濃度計,由於雙峰濾光片只讓中心波長為660nm及940nm的光通過,而其他波長的光被過濾掉,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。10‧‧‧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106‧‧‧手指
