Small-angle goniometry for backscattering measurements in the broadband spectrum

Kaasalainen, Sanna; Peltoniemi, Jouni; Näränen, Jyri; Suomalainen, Juha; Kaasalainen, M.; Stenman, Folke

doi:10.1364/ao.44.001485

Cited by 27 publications

(17 citation statements)

References 22 publications

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“…[49] Moreover, a large number of laboratory studies of planetary regolith analog powders composed of particles larger than the wavelength in contact with each other found no wavelength dependence [Shkuratov et al, 1999;Nelson et al, 2002;Kaasalainen et al, 2005]. Also, equation (17) shows that L Τ is a strong function of particle size and spacing, yet none of these laboratory analog samples displayed the dependence predicted by equations (10) and (17) [Nelson et al, , 2000Shkuratov et al, 1997;Kaasalainen, 2003;Piatek et al, 2004].…”

Section: Discussionmentioning

confidence: 99%

The wavelength dependence of the lunar phase curve as seen by the Lunar Reconnaissance Orbiter wide‐angle camera

et al. 2012

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[1] The Lunar Reconnaissance Orbiter wide-angle camera measured the bidirectional reflectances of two areas on the Moon at seven wavelengths between 321 and 689 nm and at phase angles between 0°and 120°. It is not possible to account for the phase curves unless both coherent backscatter and shadow hiding contribute to the opposition effect. For the analyzed highlands area, coherent backscatter contributes nearly 40% in the UV, increasing to over 60% in the red. This conclusion is supported by laboratory measurements of the circular polarization ratios of Apollo regolith samples, which also indicate that the Moon's opposition effect contains a large component of coherent backscatter. The angular width of the lunar opposition effect is almost independent of wavelength, contrary to theories of the coherent backscatter which, for the Moon, predict that the width should be proportional to the square of the wavelength. When added to the large body of other experimental evidence, this lack of wavelength dependence reinforces the argument that our current understanding of the coherent backscatter opposition effect is incomplete or perhaps incorrect. It is shown that phase reddening is caused by the increased contribution of interparticle multiple scattering as the wavelength and albedo increase. Hence, multiple scattering cannot be neglected in lunar photometric analyses. A simplified semiempirical bidirectional reflectance function is proposed for the Moon that contains four free parameters and that is mathematically simple and straightforward to invert. This function should be valid everywhere on the Moon for phase angles less than about 120°, except at large viewing and incidence angles close to the limb, terminator, and poles.Citation: Hapke, B., B. Denevi, H. Sato, S. Braden, and M. Robinson (2012), The wavelength dependence of the lunar phase curve as seen by the Lunar Reconnaissance Orbiter wide-angle camera,

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Section: Discussionmentioning

confidence: 99%

The wavelength dependence of the lunar phase curve as seen by the Lunar Reconnaissance Orbiter wide‐angle camera

et al. 2012

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“…A very similar discussion can be found in Kaasalainen et al (2005). First, we calculated three different bidirectional phase curves from a set of Hapke parameters, chosen to represent a typical phase curve of a bright fine grained-medium.…”

Section: Effects Of Finite Angular Resolutionmentioning

confidence: 98%

Experimental characterization of the opposition surge in fine-grained water–ice and high albedo ice analogs

Jost

Pommerol

Poch

et al. 2016

Icarus

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“…• were measured with a small-angle goniometer constructed particularly for backscattering measurements (see Kaasalainen et al 2005). All scattering measurements are relative to a Spectralon (Labsphere Inc.) reference plate, which is roughly similar to a Lambert surface in scattering properties.…”

Section: The Measurementsmentioning

confidence: 99%

“…• , we combined the phase curve obtained from the BRDF measurements with that measured with a laser-based smallangle goniometer (see Kaasalainen et al 2005). The combined plot, presented in Fig.…”

Section: Scattering Propertiesmentioning

confidence: 99%

Ground reference for space remote sensing

Kaasalainen¹,

Kaasalainen²,

Piironen³

2005

A&A

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Abstract. We present accurate laboratory CCD photometry of an artificial asteroid sample. The standard inversion method for asteroid lightcurves was implemented to reproduce the measured lightcurves and to derive the global shape, spin state and pole direction to be compared with the known laboratory values. The results imply that the inversion analysis works universally for targets of arbitrary surface composition, i.e., the scattering law does not play a strong role in the analysis. We further investigated the scattering behaviour of the surface material by direct laboratory measurements, and found that the illumination phase angle dependence can be factorized for this material in the same way as for asteroids.

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Small-angle goniometry for backscattering measurements in the broadband spectrum

Cited by 27 publications

References 22 publications

The wavelength dependence of the lunar phase curve as seen by the Lunar Reconnaissance Orbiter wide‐angle camera

The wavelength dependence of the lunar phase curve as seen by the Lunar Reconnaissance Orbiter wide‐angle camera

Experimental characterization of the opposition surge in fine-grained water–ice and high albedo ice analogs

Ground reference for space remote sensing

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