> 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...


Aaagh.
Sounds totally obvious and totally brilliant to me.
I have easy access to O2 sensor at a reasonable if not marvellous 
price.

Given the nature of the combustor involved (eg you and I and ...) the 
other gases liable to be present can probably be well enough 
quantified to make that an adequately acceptable approach.

I'd say that was one of the better 2 cents you had there. So obvious 
I'm embarrassed :-)



        Russell McMahon


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