title: Spectrogonio radiometer for the study of the bidirectional reflectance and polarization functions of planetary surfaces. 1. Design and tests.
abstract: We have developed a spectrogonio radiometer to measure in the laboratory (-35 degrees C to +30 degrees C) the bidirectional reflectance and polarization distribution functions of various types of planetary material from the UV to the near-IR (310-4800 nm). The major, to our knowledge, novel feature of this instrument is that it is capable of measuring dark to translucent materials with a high degree of radiometric accuracy under most viewing geometries. The sample surface is illuminated with a large monochromatic and polarized parallel beam (incidence: 0 degrees-90 degrees ), and the total intensity and the two polarized components of the reflected light are measured (observation, 0 degrees-80 degrees; azimuth, 0 degrees-180 degrees). The scientific and technical constraints, the design, and the performances and limitations of the system are presented in this first paper.
authors.affiliation: Laboratoire de Planétologie de Grenoble, Centre National de la Recherche Scientifique-Université Joseph Fourier, Bâtiment D de Physique, B.P. 53, 38041 Grenoble Cedex 9, France. olivier.brissaud@obs.ujf-grenoble.fr
authors.forename: Olivier
authors.initials: O
authors.lastname: Brissaud
authors.forename: Bernard
authors.initials: B
authors.lastname: Schmitt
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bonnefoy
authors.forename: Sylvain
authors.initials: S
authors.lastname: Douté
authors.forename: Patrick
authors.initials: P
authors.lastname: Rabou
authors.forename: Will
authors.initials: W
authors.lastname: Grundy
authors.forename: Michel
authors.initials: M
authors.lastname: Fily