SHADOWS: a spectro-gonio radiometer for bidirectional reflectance studies of dark meteorites and terrestrial analogs: design, calibrations, and performances on challenging surfaces

Publication

Reference: Potin Sandra, Brissaud Olivier, Beck Pierre, Schmitt Bernard, Magnard Yves, Correia Jean-Jacques, Rabou Patrick, Jocou Laurent (2018). SHADOWS: a spectro-gonio radiometer for bidirectional reflectance studies of dark meteorites and terrestrial analogs: design, calibrations, and performances on challenging surfaces. Appl. Opt., 57, 8279 - 8296.

Names

Title: SHADOWS: a spectro-gonio radiometer for bidirectional reflectance studies of dark meteorites and terrestrial analogs: design, calibrations, and performances on challenging surfaces
Abstract: We have developed a new spectro-gonio radiometer, SHADOWS, to study in the laboratory the bidirectional reflectance distribution function of dark and precious samples. The instrument operates over a wide spectral range from the visible to the near-infrared (350–5000 nm) and is installed in a cold room to operate at a temperature as low as −20°C. The high flux monochromatic beam is focused on the sample, resulting in an illumination spot of about 5.2 mm in diameter. The reflected light is measured by two detectors with high sensitivity (down to 0.005% in reflectance) and absolute accuracy of 1%. The illumination and observations angles, including azimuth, can be varied over wide ranges. This paper presents the scientific and technical constraints of the spectro-gonio radiometer, its design and additional capabilities, as well as the performances and limitations of the instrument.
Keywords: spectroscopy, optics, photometry, polarization, instrument, spectro-gonio radiometer, bidirectional reflection, visible, near-IR
Content: instrument-technique, optics, BRDF data

Doi

10.1364/AO.57.008279

Identifiers

Publications