Pulse Oximetry Measurement - EDAN H100N User Manual

H100N Pulse Oximeter User Manu Principles of Operation
The oximeter communicates with external devices
through RS-232 interface.

7.1 Pulse Oximetry Measurement

The oximeter uses oximetry to measure functional
oxygen saturation in the blood. Pulse oximetry works by
applying sensor to a pulsating arteriolar vascular bed,
such as a finger or a toe. The sensor contains a dual light
source and a photonic detector.
Bone, tissue, pigmentation, and venous vessels normally
absorb a constant amount of light over time. The
arteriolar bed normally pulsates and absorbs variable
amounts of light during the pulsations. The ratio of light
absorbed is translated into a measurement of functional
oxygen saturation (SpO ). Because a measurement of
2
SpO is dependent upon light from the sensor, excessive
2
ambient light can interfere with this measurement.
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