Pulse oximetry 2
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Define Beer’s law
states that when light is transmitted through a clear substance with a dissolved solute, the intensity of transmitted light decreases as the concentration of solute increases
Define Lamberts law
States that when a light falls on a homogenous substance, the intensity of transmitted light decreases as the distance through the substance increases
At what wavelength is oxyhaemoglobin absorbed?
red light 660nm
Name the parts involved in the measurement of oxyhaemoglobin
-LED -Phototransistor- detects intensity of transmitted light
What does it mean if there is less red blood in contrast to redder blood?
less- lower O2 saturation, less absorption, more transmission redder- higher oxygen saturation, more absorption, less transmission
Describe the relationship between light transmitted and finger size
smaller finger- less absorption= greater transmission larger finger-more absorption = less transmission
Whats the wavelength of infrared?
940nm
What do pulse oximeters measure?
-the oxygen saturation of haemoglobin in arterial blood -the pulse rate in beats per minute, averaged over 5 to 20 seconds