Radiance and spectral radiance are measures of the quantity of radiation that passes through or is emitted from a surface and falls within a given solid angle in a specified direction. They are used in radiometry to characterize diffuse emission and reflection of electromagnetic radiation. In astrophysics, radiance is also used to quantify emission of neutrinos and other particles. The SI unit of radiance is watts per steradian per square metre (W·sr−1·m−2), while that of spectral radiance is W·sr−1·m−2·Hz−1 or W·sr−1·m−3 depending on if the spectrum is a function of frequency or of wavelength.

Read more about RadianceDescription, Definition, Intensity

Other articles related to "radiance":

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Famous quotes containing the word radiance:

    The One remains, the many change and pass;
    Heaven’s light forever shines, Earth’s shadows fly;
    Life, like a dome of many-coloured glass,
    Stains the white radiance of Eternity,
    Until Death tramples it to fragments.
    Percy Bysshe Shelley (1792–1822)

    The radiance was that of the full, setting, and blood-red moon, which now shone vividly through that once barely- discernible fissure,... extending from the roof of the building, in a zigzag direction, to the base. While I gazed, this fissure rapidly widened.
    Edgar Allan Poe (1809–1849)

    Give me your poppies,
    let their radiance spill
    for ever;
    love me,
    O love me.
    Hilda Doolittle (1886–1961)