15 October 2004 Design of a semihemispherical spectroradiometer for fast acquisition of BRDF libraries in VIS and NIR
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Abstract
For the fast acquisition of large amounts of BRDF data over wavelength to be compiled into libraries, a small, fast and rugged spectro-radiometer without moving parts for angular resolution is being developed. The system consists of an elliptical mirror which maps a semi-hemisphere onto a CMOS-detector with a dynamic range of 140dB. The detector has 32887 pixels which are calibrated radiometrically in the range from 10-5 W/m2 to 100 W/m2 (7 decades). The system can take 30 semi-hemispherical BRDFs per second, i.e. nearly 1 million solid angles per wavelength per second. The smallest illumination spot has an area of 0.03mm2, for spatial averaging the sample is mounted on x-y-stages, so the largest avaraged spot can be about 50.000 mm2. Incoherent illumination is provided by a set of assorted LED's. The paper deals with the instrument design, and gives some measurement results.
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Cornelius Hahlweg, Hendrik Rothe, "Design of a semihemispherical spectroradiometer for fast acquisition of BRDF libraries in VIS and NIR", Proc. SPIE 5546, Imaging Spectrometry X, (15 October 2004); doi: 10.1117/12.555815; https://doi.org/10.1117/12.555815
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