>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 03 July 2006 13:59
>To: PIC List
>Subject: [EE] Caphograph design
>
>
>Pushing that a little further, exhaled air could be bubbled 
>through a solution causing transparency change and light 
>occlusion and the solution subsequently regenerated. Much 
>messier than I would like, but such "idea starters" may lead 
>to other things.

This might be totaly off the mark, but instead of measuring CO2 content could you perhaps measure oxygen content, which presumably will be the inverse of the CO2?  Heated, wideband exhaust gas oxygen sensors are readily available though wether they will work outside of the heat of burnt exhaust gasses I don't know.  If not maybe mix exhaled breath with a fuel gas and measure combustion temperature (using some kind of catalyst rather than open flame..e.g. the stuff use in gas powered soldering irons).

As I say, probably not even worth the $0.02 these posts are traditonaly valued at...

Regards

Mike

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