The high resolution spectral data of upwelling radiance are convolved in real time with the satellite band spectral response functions to provide band-averaged water-leaving spectral radiances
for vicarious calibration of the satellite sensor.
The output signal for a particular channel can be related to the throughput of the channel, the magnitude of the incident spectral radiance, the detector spectral flux responsivity, and some geometric factors.
lambda]]([lambda]) is the spectral radiance in watt per nanometer per square millimeter per steradian.
The NPR is calibrated on FASCAL; the relative expanded uncertainties (k = 2) in spectral radiance for the NPR are 0.
The configuration is versatile, allowing the instrument to be used in comparisons of spectral irradiance scales within NIST or between NIST and other NMIs (22), participation in field comparisons of UV downwelling surface spectral irradiance (23), in EOS comparisons of spectral radiance standards (24), and for calibrating sources at vendor facilities (25).
The sphere spectral radiance curves from SBRS are shown in Figs.
In March 1998, the OL420 was calibrated for spectral radiance in NIST's Facility for Automated Spectroradiometric Calibrations (FASCAL) .
The spectral flux entering the detector is related to the spectral radiance of the source by
The spectral radiance from fluorescence source can be defined in terms of the spectral flux from fluorescence.
The temperature of the Quinn-Lee strip lamp is determined by spectral radiance ratios to the gold-point blackbody, and the temperature of the VTBB is determined by ratios of its spectral radiance to that of the Quinn-Lee lamp.
NIST uses a variable temperature blackbody as a standard of spectral radiance to provide its spectral radiance and irradiance calibration services (148, 149); the blackbody temperature is also determined using a gold-point blackbody and spectral radiance ratios.
This achievement provided the impetus at NIST to decouple the spectral radiance
and irradiance scales from any particular temperature scale (e.