Determination of distance offsets of diffusers for accurate radiometric measurements
作者： Pasi Manninen , Jari Hovila , Lauri Seppälä , Petri Kärhä , Lasse Ylianttila
DOI: 10.1088/0026-1394/43/2/S24
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摘要: A method for the determination of effective measurement plane spectroradiometer diffusers at various wavelength regions is described. The based on inverse-square law distance dependence measured signal. scheme tested with three planar and one dome-shaped diffuser four bands. offsets determined in UVA region are from 0 mm to 2.1 6.4 dome diffuser, whereas corresponding values NIR 7.7 8.2 mm. uncertainties reference positions estimated be 0.3 If position not properly taken into account calibration measurements lamps, large systematic errors may appear when measuring radiation distant sources. We also investigate angular responsivity diffusers. clear correlation appears between dependences curves.
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