When our cat farts, a very smal amount of gas is spread all over the room
and remains constant pretty long..

Inge


On 28 August 2013 11:21, Stadem, Richard D. <[log in to unmask]>wrote:

> Find out how particle counters are calibrated. There must be a procedure
> somewhere. Then figure out a way to make it cheaper and easier to use.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
> Sent: Wednesday, August 28, 2013 12:09 PM
> To: [log in to unmask]
> Subject: Re: [TN] Blowing Smoke
>
> Hi Phil-
>
> No problem with organics.
>
> This is a good direction to consider:  An electronic cigarette.  They
> contain the micro-heater to vaporize the propylene glycol.  I can probably
> make that controlled by the Arduino I'm using, and pulse width modulate it
> to adjust how much comes out.  I may need an additional blower of some kind
> in the system, but that sounds pretty easy.
>
> I'll let you know what I find out.
>
> Thanks,
>
> Wayne
>
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Wednesday, August 28, 2013 11:25 AM
> To: TechNet E-Mail Forum; Wayne Thayer
> Subject: RE: [TN] Blowing Smoke
>
> Heat up propylene glycol, oh wait, you need inorganic particulates, right?
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
> Sent: Wednesday, August 28, 2013 8:07 AM
> To: [log in to unmask]
> Subject: [TN] Blowing Smoke
>
> 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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