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How can the radiation of gases be detected?

  1. Feb 22, 2015 #1
    I'm curious about that do gases emit infrared radiation the same way as solid bodies do? If yes, how can it be detected like an infrared camera does?
     
  2. jcsd
  3. Feb 22, 2015 #2

    Bystander

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    Yes. How to detect it and distinguish it from other sources? Tough to do since emissivities are quite low at normal T and P, or density.
     
  4. Feb 22, 2015 #3
    Thank you very much. And is there another way to distinguish warmer parts of a gas?
     
  5. Feb 22, 2015 #4

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    You've said IR already, so I presume you're interested in sensing temperature remotely, rather than measuring it directly with conventional temperature sensors. How much control do you have over your sample space? Pressure?
     
  6. Feb 22, 2015 #5

    mfb

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    Temperature differences can be detected via the density-dependent (and therefore temperature-dependent) refractive index. Schlieren photography does that, for example.

    It would help to know more about the application you are looking for.
     
  7. Feb 22, 2015 #6
    I would like to locate thermals (relatively warm, rising air) in my vicinity.
     
  8. Feb 22, 2015 #7

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    Look for hawks, eagles, pelicans. Refractive index: If you can find a landmark (or set of landmarks), and have some fixed pairs of points to sight over for directions of the landmarks, you can see them move up or down, left or right from day to day, or even hour to hour.
     
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