Pulse oximetry is a noninvasive technique
widely used. It was developed during the 1970’s and its main use is to measure
the oxygen saturation level of arterial peripheral blood, an indicator of
oxygen supply. Conventionally, a pulse oximeter has both a coherent light
source, such as a LED, emitting red (660 nm) and infrared (940 nm) light, and aphotodiode detector to measure the absorption of light.
The probe is typically
attached to a patient's finger or toe. For a finger, the probe is configured so
that the emitters project light through the tissue. The photodiode is
positioned opposite the LED in order to detect the transmitted light as it
emerges from the finger tissues. The pulse oximetry monitor determines oxygen
saturation by analyzing the differential ratio absorption of the two
wavelengths emitted by the probe. It alternately activates the probe LED
emitters and reads the resulting current generated by the photodiode detector. Read more>>>>>>>>>>>>>>
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