Well in my travels I have had the opportunity to install and calibrate
many times a Leeds and Northrup magnetic wind particle detector, used it
to measure O2 in N2 would measure in the molecular level. We used test
gasses and a mass spectrometer to calibrate the unit. .5, 1.5, 2, 4,%
O2 in N2 for the cal gasses.
When I was stationed aboard the USS Jack SSN605 in 1980-81 my Engineer
who had a PhD in Quantum Mechanics did his research on measuring the
contents of a cubic Inch of air at varying altitudes using reflected
laser light, something to do with Ozone and Smog monitoring. I think
he went to Colorado State, he was ROTC and USNavy is how he paid for it.
Lt.CDR Will Frichman I think was his name. His wife had a doctors of
Mathematics and taught at the Coast Guard Acadamy.
Pat
On Wed, Aug 28, 2013 at 11:21 AM, Stadem, Richard D. 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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