> From: Craig Webb <lucid@MAGNET.CA>
>
> What is interesting about the IR type is that they can measure both
> oxygenated and non-oxygenated blood levels (using different IR
wavelengths)

No, not different IR wavelength. Pulseoximetrs use 2 LEDs - one RED and one
IR.

> and I've also even heard of some researchers doing studies with the shape
of
> the pulse curve which can tell information about heart valves and
blockages,
> etc. Very interesting.

Yes, but it is an expecive device. You need 20-bit ADC to measure REDmax,
REDmin, IRmax, IRmin
value and then calculate SO2, but I never see the formula to calculate
it.....


Alex Torres, Kharkov, Ukraine (exUSSR)
altor@chat.ru
2:461/28@FidoNet
http://www.geocities.com/SiliconValley/Lab/6311