Datex-Ohmeda F-LM1 Technical Reference Manual page 143

Intensity of
transmitted
I max
(DC-component)
light
Transmitted
light
No pulsation
Incident light
Emitter
RED
Detector
Figure 1 Absorption of infrared light in the finger and finger sensor parts layout and
schematic diagram
Pulsatile blood
SpO sensor cable
2
IRED
Functional description
I max
AC-component
I min
Variable absorption
due to pulse added
volume of arterial
blood
Arterial blood
Venous blood
Tissue
Time
SpO sensor connector
2
6
GND
7
I
LED
4
5
GND
8
V
B
C
R
1
I
S
9
GND
Document No. 8000060-1
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