Abstract

We determine the backscatter reflectance (more properly the bidirectional reflectance distribution function at a 45° angle of incidence and observation) for circularly polarized radiation of λ = 10.6 μm for 120-grit aluminum oxide sandcloth (1.5 × 10⁻² sr⁻¹) and 400-grit silicon carbide sandpaper (1.1 × 10⁻² sr⁻¹) with respect to sublimed flowers of sulfur (1.8 × 10⁻¹ sr⁻¹). The effect of range and the atmospheric effect of turbulence-induced beam wander are discussed for both rotating disks and linearly translated belts. The advantages of large slowly rotating disks for field calibrations are presented.

© 1980 Optical Society of America

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