How does a IR thermometer work?

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SUMMARY

Infrared (IR) thermometers measure the temperature of an object by detecting the intensity of emitted infrared radiation. They are capable of measuring the temperature of clouds due to the transparency of air to infrared wavelengths, which prevents interference from the air between the cloud and the detector. Pointing an IR thermometer at the sun or a traditional light bulb can potentially damage the device, as it is sensitive to visible black body radiation. Understanding these principles is essential for effective and safe use of IR thermometers.

PREREQUISITES
  • Understanding of infrared radiation principles
  • Familiarity with the concept of black body radiation
  • Knowledge of the functionality of infrared thermometers
  • Basic physics of light and temperature measurement
NEXT STEPS
  • Research the different types of infrared thermometers and their applications
  • Learn about the physics of infrared radiation and its interaction with materials
  • Explore safety guidelines for using IR thermometers in high-temperature environments
  • Investigate the calibration and maintenance of infrared thermometers
USEFUL FOR

This discussion is beneficial for engineers, scientists, and technicians who utilize infrared thermometers in their work, as well as educators teaching principles of thermodynamics and optics.

mcjhn
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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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mcjhn said:
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

.
 
hi, thanks I already had a look on there and couldn't find the info I was after
 
They measure the wavelength...and air is transparent to ir.
 

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