H100N Pulse Oximeter User Manu Principles of Operation
- 91 -
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
2
). Because a measurement of
SpO
2
is dependent upon light from the sensor, excessive
ambient light can interfere with this measurement.
To Next Page
Loading...
