EDAN H100N User Manual page 101

H100N Pulse Oximeter User Manu Principles of Operation
hemoglobin, the oximeter uses the pulsatile nature of
arterial flow.
During systole, a new pulse of arterial blood enters the
vascular bed, and blood volume and light absorption
increase. During diastole, blood volume and light
absorption reach their lowest point.
The oximeter bases its SpO measurements on the
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difference between maximum and minimum absorption
(measurements at systole and diastole). By doing so, it
focuses on light absorption by pulsatile arterial blood,
eliminating the effects of non-pulsatile absorbs such as
tissue, bone and venous blood.
Wavelength
The Oximax sensor contains LEDs that emit red light at
a wavelength of approximately 660 nm and infrared light
at a wavelength of approximately 900 nm.
The total optical output power of the sensor LEDs is less
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