Abstract
A methodology is presented to calibrate pyrgeometers measuring atmospheric long-wave radiation, if their spectral dome transmission is known. The new calibrationprocedure is based on a black-body cavity to retrieve the sensitivity of the pyrgeometer, combined with calculated atmospheric long-wave spectra to determine a correction function in dependence of the integrated atmospheric water vapor to convert Planck radiation spectra to atmospheric long-wave spectra. The methodology was validated with two custom CG4 pyrgeometers with known dome transmissions by a comparison to the World Infrared Standard Group of Pyrgeometers at the World Radiation Center–Infrared Radiometry Section. The responsivities retrieved using the new laboratory calibration agree to within with the responsivities determined by a comparison to the WISG, which is well within the uncertainties of both methodologies.
© 2007 Optical Society of America
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