E-PSM(P)W module introduction
1-45
Document no. 2044677-001
Pulse rate
The pulse rate calculation is done by peak detection of the plethysmographic pulse wave. The
signals are filtered to reduce noise and checked to separate artifacts.
Figure 25 Absorption of infrared light in the finger
Figure 26 Pulse oximetry probe parts layout and schematic diagram
absorption_of_light.vsd
No pulsation
Pulsatile blood
Time
Venous blood
Tissue
Arterial blood
Intensity of
transmitted
light
Transmitted
light
Variable absorption
due to pulse added
volume of arterial
blood
Imax (DC-component)
Imax
Imin
Incident light
AC-component
PSM_absorption_of_infrared.vsd
Emitter
Detector
SpO2 sensor connector
IRED
RED
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