spectral radiance


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spectral radiance

[′spek·trəl ′rād·ē·əns]
(optics)
The radiant flux per unit wavelength or frequency interval per unit solid angle per unit of projected area of the source; the usual unit is watt per nanometer per steradian per square meter.
References in periodicals archive ?
Wayne, IN, which is used to illuminate the ABI earth-port for determination of its visible-near infrared spectral radiance response functions, was measured in April 2013 by NIST (Carol Johnson and Steve Maxwell) to validate its radiance scale.
Use of spectral radiance for correcting in-season fertilizer nitrogen deficiencies in winter wheat.
HALO passes a cloud and specMACS observes a vertical column of pixels and records the spectral radiances reflected by the cloud.
Key words: calibration coefficients; detector-based calibrations; filtered radiometer; mean wavelength; radiometry; spectral radiance.
i,j] is the digital number output by instrument detector i in band j, G is the instrument detector plus digitization gain, L([lambda]) is the spectral radiance at the instrument entrance aperture, [A.
n] is the spectral radiance of a black-body at wavelength [[lambda].
With respect to the pre-launch calibration of the EOS Terra and Landsat 7 ETM+ instruments, a set of transfer radiometers operating in the visible through shortwave infrared wavelength region (from 400 nm to 2500 nm) has been independently developed and calibrated by several metrology laboratories and used to assess standard sources of spectral radiance.
The measured fluorescence spectral radiance is given in terms of measured signals by (Eq.
The guiding principle for the calibration was to perform separate, controlled experiments for each parameter affecting the conversion from light to signal; these parameters are dark signal, linearity, exposure time, and spectral radiance responsivity.
A good example comes from pyrometry, where the determination of the spectral radiance of a blackbody source can be used to infer its temperature using the Planck law.

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