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

Cornelius Hahlweg; Hendrik Rothe

doi:10.1117/12.555815

15 October 2004 Design of a semihemispherical spectroradiometer for fast acquisition of BRDF libraries in VIS and NIR

Cornelius Hahlweg, Hendrik Rothe

Proceedings Volume 5546, Imaging Spectrometry X; (2004) https://doi.org/10.1117/12.555815
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

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.

Citation Download Citation

Cornelius Hahlweg and 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); https://doi.org/10.1117/12.555815

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