Abstract
The paper presents a comparative mathematical study of the possible solutions of the double-prisms neutral density filters. After a brief overview of the optical devices used for the attenuation of light (especially in spectrophotometers and colorimeters), the three different arrangements, not only of the double-wedges, but, more generally, of the double-prisms, are considered; two of the solutions, in the double-wedges form, being but suggested in the state-of-the-art. An extension of the existing theory is thus achieved. The characteristic parameters of each of the possible solutions of this optical attenuator are defined, obtained and compared, in order to select the optimal device. From the study, the best solution of the double-prisms neutral density filters, both from the mechanical and from the optical point of view, is ascertained. The designing calculus of the resulted attenuator is also developed.
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