where a is the Stefan-Boltzmann constant 1, = 1 or 2 is the polarization factor for polarized or unpolarized radiation and the B^ are geometric factors given by In equation 8 is the angle between the direction radiation is incident from and the normal to the surface of component i, while fl- is the solid angle subtended by component j when viewed from component i. BT denotes the value computed using equation 8 for the total solid angle accessible to the converter RH. The following relations apply:13 The model of Landsberg and Baruch [13] has been extended to cover the case where the radiation emitted by component i (i = p,c) is partially polarized. The flux Qj may be decomposed into a flux <Pipo1 of polarized radiation (1, = 1) and a flux $iunpo1 of polarized radiation (1; = 2) [14 pg. 163]. A polarization coefficient P; 6 [0,1] is defined so that: When P; = 1 the radiation emitted is completely polarized while P, = 0 corresponds to unpolarized radiation. Combining equations 6 and 11 the energy flux for partially polarized radiation is obtained:
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