pulse oximetry (blood oxygen) sensors

[Jimi]

I was wondering if anyone has done any experimenting with these. I
was curious about how they work. I don't think it would be as simple
as just giving it a voltage to power it, and getting some level back
as a percentage of O2. I'm wondering if you need to pulse each of the
two LED circuits, and then I'm assuming that there are individual
sensors for the amount of light received. Then it would be software
to figure out what it all means.

Maybe this is too complicated for this group, I don't know. If
someone has a better idea of where to look, that would be appreciated
as well.

 

[John Fields]

On Wed, 13 Jul 2011 08:22:37 -0700 (PDT), Jimi <jimidotorg@gmail.com>
wrote:

I was wondering if anyone has done any experimenting with these. I
was curious about how they work. I don't think it would be as simple
as just giving it a voltage to power it, and getting some level back
as a percentage of O2. I'm wondering if you need to pulse each of the
two LED circuits, and then I'm assuming that there are individual
sensors for the amount of light received. Then it would be software
to figure out what it all means.

Maybe this is too complicated for this group, I don't know. If
someone has a better idea of where to look, that would be appreciated
as well.

---
Google is your friend.

http://www.medicalsupplygroup.com/pulse-oximeters.aspx

--
JF

 

[Rich Grise]

John Fields wrote:

On Wed, 13 Jul 2011 08:22:37 -0700 (PDT), Jimi <jimidotorg@gmail.com

I was wondering if anyone has done any experimenting with these. I
was curious about how they work. I don't think it would be as simple
as just giving it a voltage to power it, and getting some level back
as a percentage of O2. I'm wondering if you need to pulse each of the
two LED circuits, and then I'm assuming that there are individual
sensors for the amount of light received. Then it would be software
to figure out what it all means.

Maybe this is too complicated for this group, I don't know. If
someone has a better idea of where to look, that would be appreciated
as well.

Google is your friend.

http://www.medicalsupplygroup.com/pulse-oximeters.aspx

AAAAAARRRRRGH!!!!!!!!!

THERE IS NO APOSTROPHE IN THE POSSESSIVE ITS!!!!!!!!!!!!

That really impugns that webpage's writer's credibility.

Thanks,
Rich

 

[Jon Kirwan]

On Wed, 13 Jul 2011 08:22:37 -0700 (PDT), Jimi
<jimidotorg@gmail.com> wrote:

I was wondering if anyone has done any experimenting with these. I
was curious about how they work. I don't think it would be as simple
as just giving it a voltage to power it, and getting some level back
as a percentage of O2. I'm wondering if you need to pulse each of the
two LED circuits, and then I'm assuming that there are individual
sensors for the amount of light received. Then it would be software
to figure out what it all means.

Maybe this is too complicated for this group, I don't know. If
someone has a better idea of where to look, that would be appreciated
as well.

Texas Instruments has an AP-note on the subject.
http://focus.ti.com/lit/an/sprab37a/sprab37a.pdf
http://focus.ti.com/lit/an/slaa274a/slaa274a.pdf

The latter one is for the MSP430 device (cheaper.) The
details in the apnotes will help you understand the details a
little better. I gather that is part of what you want.

Jon

 

[Tom Biasi]

"Rich Grise" wrote in message news:ivknmh$e6m$3@dont-email.me...

John Fields wrote:

On Wed, 13 Jul 2011 08:22:37 -0700 (PDT), Jimi <jimidotorg@gmail.com

I was wondering if anyone has done any experimenting with these. I
was curious about how they work. I don't think it would be as simple
as just giving it a voltage to power it, and getting some level back
as a percentage of O2. I'm wondering if you need to pulse each of the
two LED circuits, and then I'm assuming that there are individual
sensors for the amount of light received. Then it would be software
to figure out what it all means.

Maybe this is too complicated for this group, I don't know. If
someone has a better idea of where to look, that would be appreciated
as well.

Google is your friend.

http://www.medicalsupplygroup.com/pulse-oximeters.aspx

AAAAAARRRRRGH!!!!!!!!!

THERE IS NO APOSTROPHE IN THE POSSESSIVE ITS!!!!!!!!!!!!

That really impugns that webpage's writer's credibility.

Thanks,
Rich

FWIW: http://en.wikipedia.org/wiki/Venous_blood