Experimental study of visible and IR light reflection by planetary-like granular materials

Details Experimental study of visible and IR light reflection by planetary-like granular materials Experimental study of visible and IR light reflection by planetary-like granular materials

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....12152d&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #12152

Physics

Scientific paper

The exploration of planetary surfaces by spacecrafts now often involves imaging spectroscopy in the visible and near infrared ranges. The development of methods to analyse the generated image cubes requires theoretical as well as experimental studies to model the bidirectional reflectance (BRDF) of dense granular materials. The physics of the reflection depends on many parameters like the intrinsic optical properties, the shapes, sizes and the packing density of the mineral or icy grains forming the top few centimeters of many solid planetary surfaces. The structural characteristics of the transition zone between the materials and the atmosphere or the vacuum may also play a key role. In particular surface roughness at the scale of tens of grain lengths and facets preferentially oriented in the horizontal plane may greatly determine the BRDF. In this paper, we present the results of a systematic experimental campaign designed to quantify the dependence of the BRDF on the crucial parameters mentioned above. For that purpose we measured, with a spectrophoto-goniometer, the BRDF of various test granular materials (paraffin, glass fragments, epsomite or sodium fluoride, etc.) at several wavelengths. These materials present an increasing optical index from 1.32 to 3.4 and sometimes show isolated absorption bands. They come in various grain sizes and shapes and were prepared using different methods to make samples with different surface textures.

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