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Salamander Ceramic Infrared Emitters Technical Manual Page 8

En Espaol

Planck's Law:

        In order to understand the spectral distribution of infrared radiation from a source we must first understand Planck's Law. Planck's Law gives us the spectral distribution of radiation from a blackbody source. That is, a source that emits 100% infrared radiation at a given single temperature. It is important to understand at this point that in practice, infrared sources are made up of thousands of "point sources" that are all at different temperatures. Each point source will have a different spectral distribution and the combination of point sources will make up the entire spectral distribution. Therefore, we can only approximate the spectral distribution using an average surface temperature and emissivity value.

                (e) x ( 2.416069 x 10
-25 )            Watts
R(λ) =    _______________________________________________
                ( λ ) 5 [ exp .014408/λT - 1 ]            in 2 . m

    e = Emissivity of Source
    λ = Wavelength in Meters
    T = Temperature in K (Kelvin)
        K = (F + 460) / 1.8

Spectral Distribution of a "Blackbody"
At Various Temperatures
wpe5.gif (3901 bytes)wpe3.gif (6507 bytes)
Wavelength, Microns (λm)

"A"....800 F, λm = 4.14 mm             "B"....1000 F, λm = 3.57 mm
"C"....1200 F, λm = 3.14 mm           "D"....1400 F, λm = 2.81 mm

Page 7    Page 9
Technical Manual Table of Contents
Technical Manual in Acrobat .pdf format

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