BLOOD_OXYGEN_MEASUREMENT

Published:2009/7/16 21:39:00 Author:Jessie | From:SeekIC

An oximeter measures the amount of oxygen in your blood by shining light through some part of your body-traditionally the earlobe, nowadays often the finger-and comparing the transmission of two different wavelengths, 800 nm (in the near infrared) and 640 nrn (bright red). If they're about the same, your oxygen is very low; if your blood is well oxygenated, the 640-nm transrnission will be much higher. The light sources are LEDs, and the detector is a silicon photodiode or phototransistor.



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