How does a IR thermometer work?


by mcjhn
Tags: black body radiation, infra red, thermodynaics, thermometer
mcjhn
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#1
Jul1-11, 05:15 PM
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was just wondering...

Do IR thermometers measure the temperature of an object via the intensity or wavelengths of emitted light?

I've heard that you can measure the temperature of clouds with them, why doesn't the IR light emitted by the air in between the cloud and the detector confuse it?

[**I've heard this can damage them] What happens you point one at the sun? or an old fashioned light bulb? (is it not sensitive to visible black body radiation)?

(hopefull those make sense) thanks!
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berkeman
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#2
Jul1-11, 05:21 PM
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Quote Quote by mcjhn View Post
was just wondering...

Do IR thermometers measure the temperature of an object via the intensity or wavelengths of emitted light?

I've heard that you can measure the temperature of clouds with them, why doesn't the IR light emitted by the air in between the cloud and the detector confuse it?

[**I've heard this can damage them] What happens you point one at the sun? or an old fashioned light bulb? (is it not sensitive to visible black body radiation)?

(hopefull those make sense) thanks!
Welcome to the PF.

Wikipedia has an intro article:

http://en.wikipedia.org/wiki/Infrared_thermometer

.
mcjhn
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#3
Jul2-11, 04:14 PM
P: 2
hi, thanks I already had a look on there and couldn't find the info I was after

russ_watters
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#4
Jul2-11, 05:48 PM
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How does a IR thermometer work?


They measure the wavelength....and air is transparent to ir.


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