Old 06-20-2012, 09:11 AM #1
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Question My multimeter has a temp input; potential LPM?

Hi everyone,

So I've seen some DIY infrared LPMs on LPF and was wondering if I could potentially make one with the multi I currently own. The images below show my 1mW greenie changing the temp of the sensor by 21 degrees in less than 20 seconds.

If I could figure out the material used, maybe I could use some physics to play around with heat capacities and energies? I am aware that the sensor reflects lots of light so this is an issue. This is simply more of an idea than anything. I'd appreciate input from anyone.

Before:
http://i.imgur.com/kHZ0K.jpg
*after 20 seconds*
http://i.imgur.com/PcBP6.jpg


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Old 06-20-2012, 01:02 PM #2
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Default Re: My multimeter has a temp input; potential LPM?

Has been discussed before...

Yes you can detect a Laser beam... It will be as accurate as
sticking a wet finger in the air to get an accurate wind speed...

There are many more factors to consider than just and increase
in temperature.


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Last edited by lasersbee; 07-01-2012 at 03:28 PM. Reason: Spelling errors
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Old 06-20-2012, 03:37 PM #3
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Default Re: My multimeter has a temp input; potential LPM?

But generally LPMs work like this right ? What's the difference ?
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Old 06-20-2012, 03:44 PM #4
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Default Re: My multimeter has a temp input; potential LPM?

LPMs detect temperature differentials not direct temperature
and must be calibrated to a know accurate source.


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Old 06-20-2012, 04:33 PM #5
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Default Re: My multimeter has a temp input; potential LPM?

I can tell you now...that ain't no true 1 mw...It shouldn't make it rise anywhere near that much...especially with some being reflected.
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