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 ******0nm wave length
light band.Infrared light is in the *******0nm 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) **0nm
(INFRARED) **0nm
