Optical polarization studies of latex beads in aqueous solution: An analog for radar scattering in icy regolith

Planetary and Space Science, Journal Year: 2024, Volume and Issue: 244, P. 105891 - 105891

Published: March 26, 2024

This study presents low phase angle 0°–5° measurements of polarimetric properties icy planetary regolith analog materials acquired using the custom-built Multi-Axis- Goniometer-Instrument (MAGI). We present same sense (SC), and opposite (OC) backscatter circular polarization coefficients, ratio (CPR), degree linear (DLP) spherical latex (non-dye) beads varying sizes volume concentrations (v/v) in aqueous solutions (λ=0.8μm) water. also alumina powder air at λ=1.064μm. Measurements showed that a incidence (i=0°), is dominated by surface specular single-bounce scattering, hides other scattering processes. At high (i=15°) angle, becomes negligible, allowing for detection diffuse, dihedral (multiple bounces) scattering. find classical Mie particles (2.1μm,4.0μm) enhance subsurface due to larger void space relative (30μm), cause radar signal scatter forward off small imperfections, maintaining generating >1 CPR. Latex beads, representing impurities, demonstrate impact isotropic anisotropic on signatures. found medium's anisotropy correlates size while medium inversely with bead concentration beads. Rayleigh from reduced cross-section higher transparency generate single bounce sample platform, producing OC≫SC (<0.5) CPR across all v/v. impurities transparent water-ice simulate underlying layers. Conversely, large intensifies direction CPR, proportional concentration. aids interpreting observations bodies solar system, providing insights into interplay between waves compositions.

Language: Английский

Principal-plane BRDF of CO2 ice morphologies in controlled Mars polar conditions

Icarus, Journal Year: 2024, Volume and Issue: 426, P. 116347 - 116347

Published: Oct. 18, 2024

Language: Английский