RESUMO
An analytical procedure is presented for the calculation of the maximum of transmittance in a limited spectral region and of the efficiency of a given multilayer configuration when the thickness is altered of certain films in the stack. This refining process method is employed in examples where the spectral transmittance is improved when only a few matching layers are used for refining.
RESUMO
The design of a solar concentrator is presented; it consists of a spherical mirror and a field of Fresnel mirror facets deployed on a spherical surface so that sine condition is satisfied, eliminating both spherical aberration and coma. This particular easy to construct optical system yields high concentration ratios and has the distinct advantage of having a narrow beam aperture near the receiver. These design features make the concentrator particularly suitable for thermophotovoltaic applications.
RESUMO
In this paper expressions for the transmittance and the reflectance of a system consisting of a spacer surrounded by two multilayer stacks are presented. These expressions provide a general approach for the design of multilayer coatings. High- and low-transmittance bands and a narrowband in the transmittance spectrum of multilayer stacks with unequal designed wavelengths are reported.
