Don't laugh now, I am serious. A kind of cycle pump, but with a very small
diameter nozzle. Pull the handle and suck a second sniff of cigarett smoke,
continue pulling handle until pump is filled with air/smoke mixture. Now
press handle slowly and you get a constant stream of mixture. Simple and
cheap. Guess the nozzle should be fractions of a millimeter.

Inge


On 28 August 2013 08:07, Wayne Thayer <[log in to unmask]> wrote:

> OK, here's another problem I've been playing with (although it has little
> to do with IPC mission, it might be related).
>
> I am trying to build a system for measuring airborne particulates for
> humanitarian organizations looking for inexpensive ways to measure/monitor
> indoor air quality.  There are cheap sensors available which might do the
> job, but they would need periodic re-calibration.
>
> So I need a controlled, extremely small amount of smoke.  At first, I
> thought this would be trivial:  Find a cheap part at DigiKey and put too
> many watts through it.  Way too much smoke and too little control.  Then I
> tried burning thin wires.  Too irregular because sometimes they incinerate
> completely and other times they find a tiny defect and just burn that until
> the wire stops conducting.  Then I tried just heating the wire enough to
> burn off the insulation.  Still too irregular!  I did just a few
> experiments and got 30% variation.
>
> Now I'm starting to think maybe a tiny piece of paper on an automotive
> cigarette lighter.  That's a lot of power to get that glowing, and it is
> not convenient to attach to.  Any other ideas?
>
> Wayne
>
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