Fundamentals of radiometry

Details Fundamentals of radiometry Fundamentals of radiometry

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984semt.rept...49s&link_type=abstract

In its Solar Elements: Measuring Tech. and Physical Fundamentals p 49-62 (SEE N86-14728 05-44)

Physics

Calibrating, Plancks Constant, Radiometers, Standards, Thermal Radiation, Accuracy, Black Body Radiation, Solar Cells

Scientific paper

Primary radiometric standards chosen with a view to the user of solar elements are presented. The developed Planck radiator has a 10 mm diameter aperture and consists of graphite cylinders with a total length of 35 cm. In the visible range a relative measuring uncertainty of 1.5% is found. The primary receiver standards for low and high (a few solar constants) radiation strength are described. The absorption degree of the former is almost 1, its spectral sensitivity is constant; and the calibration uncertainty of a radiometric scale based on this receiver is + or - 0.2%; for the latter this uncertainty is + or - 0.3%. The calibration uncertainty of radiation standards for radiation strength (global radiation) is 0.5%. The uncertainty of standards for spectral radiation strength is 2% in the visible and 3% in the IR spectrum. The calibration of selective and unselective user receiver standards is described. The use of photo-elements as a selective user standard is discussed.

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