Statistics – Methodology
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982eras.nasa...53c&link_type=abstract
In NASA. Langley Research Center Earth Radiation Science Seminars p 53-88 (SEE N82-33320 23-93)
Statistics
Methodology
1
Field Of View, Pyroheliometers, Radiometers, Radiometric Correction, Solar Constant, Angles (Geometry), Dynamic Response, Efficiency, Imaging Techniques, Response Bias, Temperature Effects
Scientific paper
The radiometric methodology in use with a narrow field of view radiometer for observation of the solar constant is described. The radiation output of the Sun is assumed to be constant, enabling the monitoring of the solar source by an accurately pointed radiometer, and the Sun's output is measured as a function of time. The instrument is described, its angular response considered, and principles for absolute radiometric measurement presented. Active modes of operation are analyzed, taking into consideration instrumental perturbations and sensor efficiency, heating wire effect, cavity sensor efficiency, thermal effects on the surface of the sensitive area, the effect of the field of view limiting system, and the frequency response of the heat flux detector and absolute radiometric system. Performance of absolute measurements with relatively high accuracy is demonstrated.
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