SOVAP radiometer parameters’ definition and typical values for the “Rad 10” mode.
|Pcl,l − Po,r||Difference in electrical power applied to the cavities||~0.1056 W|
|C1||Correction to take into account the heating effects by the wires||5.9 × 10−6 W|
|C2||Correction for the accuracy of the servo-system (almost negligible)||1.2 × 10−6|
|C′3||Correction of the thermal radiative effects of the left shutter||~0.405 W m−2|
|C4||Correction of the thermal radiative effects of the mirror above the cavity||~−0.175 W m−2|
|C5||Total correction factor for the optical effects (diffraction and scattering)||0.999447805|
|αeff,r||Efficiency of the right cavity||0.9987|
|Ar at 20 °C||Measured accurate aperture area at 20 °C||7.876 × 10−5 m2|
|Δr||Aperture area (AA) correction factor – expansion of the mirror||~1.9 × 10−8|
|Δ′r||AA correction factor – expansion of the radiometer||~5.4 × 10−8|
|Δ″r||AA correction factor – deformation during mechanical clamping||~0|
|cos θ||Solar pointing angle of the radiometer||~1|
|ΔPo,r||Thermo-electrical non-equivalence of the active cavity while open||~0.3 × 10−3 W|
|KRad10||Thermo-electrical non-equivalence between the right and the left cavity||~2.83 × 10−3 W|
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