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Examples of the pulse oximeter signal


The following pictures show samples of pulse oximeter signals. The signal obtained using the red wavelength is shown in red. The signal from the infra red source is shown in blue.

Patent



At high SATs values the red pulseatile signal is relatively small whilst the infra red pulseatile signal is relatively large. The ratio of red over infra red is at its lowest.






Patent



As SATs values fall the red pulseatile signal becomes relatively larger whilst the infra red pulseatile signal becomes relatively smaller and the value of R increases. At SATs values reach the low 80s the pulsatile signals for the red and infra red are about the same size and the value of R is about 1.






Patent



At SATs values fall below 80% the red pulsatile signal becomes larger than the infra red pulsatile signal and the value of R increases above 1.








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