Smiths Medical BCI Pulse Manual De Instrucciones página 20

measurement, the signal strength resulting
from each light source depends on the color
and thickness of the body tissue, the sensor
placement, the intensity of the light sources, and
the absorption of the arterial and venous blood
(including the time varying effects of the pulse) in
the body tissues.
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Figure 2.1: Pulse Oximetry Theory of Operation
q Low intensity Red and Infrared LED
light sources
w Detector
Oximetry processes these signals, separating the
time invariant parameters (tissue thickness, skin
color, light intensity, and venous blood) from the
time variant parameters (arterial volume and SpO
to identify the pulses and calculate functional
oxygen saturation. Oxygen saturation calculations
can be performed because blood saturated with
Finger Oximeter Operation Manual
Chapter 2: Intended Use and Features
)
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