Abstract
In this paper we formulate the basic concept of a bichromatic image technique. Specic examples of its application are analyzed in the context of research into solar plasma characteristics by pinpointing its merits and demerits. Specialized requirements to the spectral devices are set forth, which may be summarized as: a) the pres- ence of two nearby identical spectral passbands; b) the mutual orthogonality for the polarization of the light that has passed through neighboring bands; and c) the possibil- ity of controlling the relative position of the bands. Several alternative plausible implementations of the method are considered with the use of Fabry-Perot interferometers (FPI) and magnetooptical lters (MOF) for measuring the longitudinal magnetic eld strength and the intensity eld. A new design of a lter magnetograph is proposed, based on MOF, with the combination of two optical reso- nance cells into one.
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