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20
11. REFERENCE
Measurement Principle
Oxygen Saturation Monitor PULSOX-2 is a photometric instrument
that non-invasively and continuously measures the oxyhemoglobin
saturation of arterial blood (SpO
2) and the pulse rate. SpO2 is
described by the equation:
SpO2 =
C (HbO
2)
× 100 (% SpO
2)
C (HbO
2) + C (Hb)
where
C (Hb): Concentration of reduced hemoglobin
C (HbO
2): Concentration of oxyhemoglobin
The light-absorption characteristics of reduced hemoglobin (Hb) are
very different from those of oxyhemoglobin. The PULSOX-2
measures the changes in the absorption of red and infrared lights
passing through the tissue to determine the SpO2 of the blood. Thus,
this method is free from the effects of skin color, muscles, bones,
and veins.
Spectral Absorption of Hb and HbO
2
×10
-6
cm
2
mole
1.0
HbO
2
Hb
0.5
600 700 800 900nm880665
Red light Infrared light
Wavelength
Absorption coefficient