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Proceedings Paper

Design of a semihemispherical spectroradiometer for fast acquisition of BRDF libraries in VIS and NIR
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Paper 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.

Paper Details

Date Published: 15 October 2004
PDF: 12 pages
Proc. SPIE 5546, Imaging Spectrometry X, (15 October 2004); doi: 10.1117/12.555815
Show Author Affiliations
Cornelius Hahlweg, Helmet Schmidt Univ./Univ. of the Federal Armed Forces (Germany)
Hendrik Rothe, Helmet Schmidt Univ./Univ. of the Federal Armed Forces (Germany)

Published in SPIE Proceedings Vol. 5546:
Imaging Spectrometry X
Sylvia S. Shen; Paul E. Lewis, Editor(s)

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