Claudio Macculi, Mario Zannoni, Oscar Antonio Peverini, Ettore Carretti, Riccardo Tascone, and Stefano Cortiglioni, "Systematic effects induced by a flat isotropic dielectric slab," Appl. Opt. 45, 5168-5184 (2006)
The instrumental polarization induced by a flat isotropic dielectric slab in
microwave frequencies is discussed. We find that, in spite of its isotropic nature,
such a dielectric can produce spurious polarization either by transmitting
incoming anisotropic diffuse radiation or emitting when it is thermally inhomogeneous.
We present evaluations of instrumental polarization generated by
materials usually adopted in radio astronomy, by using the Mueller matrix
formalism. As an application, results for different slabs in front of a
receiver are discussed. Such results are based on measurements of their
complex dielectric constants. We evaluate that a
thick Teflon slab
introduces negligible spurious polarization ( in transmission and
in emission), even minimizing the leakage ( from Q to U
Stokes parameters, and vice versa) and the depolarization
.
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The limits are from Eq. (51), introduced by the HDPE, Teflon, and polypropylene isotropic slab. The thickness adopted is d0. ΔTbMAX = 100 μK and ΔTphMAX = 1 K (the same for U).
The limits are from Eqs. (53) and (54), introduced by a HDPE, Teflon, and polypropylene isotropic slab by taking into account the BaR-SPOrt feed. The thickness adopted is d0. ΔTbMAX = 100 μK and ΔTphMAX = 1 K (the same for U).
The limits are from Eq. (51), introduced by the HDPE, Teflon, and polypropylene isotropic slab. The thickness adopted is d0. ΔTbMAX = 100 μK and ΔTphMAX = 1 K (the same for U).
The limits are from Eqs. (53) and (54), introduced by a HDPE, Teflon, and polypropylene isotropic slab by taking into account the BaR-SPOrt feed. The thickness adopted is d0. ΔTbMAX = 100 μK and ΔTphMAX = 1 K (the same for U).