Spectrogoniometer for measuring planetary surface materials at small phase angles

Details Spectrogoniometer for measuring planetary surface materials at small phase angles Spectrogoniometer for measuring planetary surface materials at small phase angles

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apopt..27..161b&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 27, Jan. 1, 1988, p. 161-165.

Physics

Optics

5

Albedo, Goniometers, Planetary Surfaces, Reflectance, Spectrographs, Barium Sulfides, Brightness, Data Acquisition

Scientific paper

This paper describes an instrument, termed spectrogoniometer, which was designed to measure the bidirectional reflectance properties of planetary surface analogs at very small phase angles. By using a pellicle beam splitter, a highly collimated laser light source, and a carefully aligned apparatus it was possible to measure the reflectance properties of geologic samples under any viewing geometry: the angles of incidence and emission ranging from 0 to 90 deg, and the azimuthal angle ranging from 0 to 360 deg. The results on the effect of porosity are demonstrated by comparing measurements on a compact sample (with a void space of 25 percent) and a fluffy sample (with a void space of 90 percent). The fluffy sample exhibited a 30-percent increase in intensity between 10 and 0 deg, whereas the compact sample exhibited only a 20-percent increase.

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