spO2 calculation

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Joined:Sat Feb 18, 2017 7:39 am
spO2 calculation

Post by Rogers » Mon Mar 06, 2017 1:06 pm

Can any body help me out of this dilemma? I need to know how to calculate spO2 from photo transistor output. In depth explanations are most welcome!!!
I have done this calculation before by using the below formula.
Ratio (R) = ((AC rms of Red LED)/DC of Red LED)) / ((AC rms of IR) / (DC of IR))
spO2 = 110 - 25xR
Is this correct?

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