Fingertip Pulse Oximeter

Product Details

The principle of pulse oximeter is based on there dand infrared light absorption characteristics of oxygenated and deoxygenated hemoglobin. Oxygenated hemoglobin absorbs more infrared light and allows more red light to pass through (Figure 1). Deoxygenated (or reduced) hemoglobin absorbs more redlight and allows more infrared light to pass through.Red light is in the 600-750nm wave length light band.Infrared light is in the 850-1000nm wave length light band. Pulse oximeter sensors have red and infrared low voltage light emitting diodes (LEDs) wich serve as light sources. The emitted light is transmitted through the tissue, then detected by the photodetector and sent to the microprocessor of the pulse oximeter. All constituents of the human body, venous and arterial blood, and tissue absorb light (Figure 2). The pulsating of arterial blood results in changes in the absorption to to added hemoglobin (Hb) and oxygenated hemoglobin (HbO2) in the path of the light. Since HbO2 and Hb absorb light to varying degrees, this varying absorption is translated into plethysmographic waveforms at both red and infrared wavelengths. The relationship of red and infrared plethysmographic signal amplitude can be directly related to arterial oxygen saturation.
Dear users, thank you very much for purchasing the Pulse Oximeter.
(RED) 660nm
(INFRARED) 910nm