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Fwd: Re: [sun_lit] Blood as a light carrier
Let me add that the oxygenated blood absorbs light at 660nm (red light), whereas
deoxygenated blood absorbs light preferentially at 940nm (infra-red). Based on
this particularity were made the pulse oximeters, consisting of two light
emitting diodes, at 600nm and 940nm, and two light collecting sensors, which
measure the amount of red and infra-red light emerging from tissues traversed by
the light rays. The relative absorption of light by oxyhemoglobin (HbO) and
deoxyhemoglobin is processed by the device and an oxygen saturation level is
reported.
Petre
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