INVESTIGATION OF THE GEOMETRY OF ILLUMINATION IN TWO-BEAM INTERFEROMETERS
This work is devoted to the study of the geometry of illumination in two-beam interferometers. The study is relevant and promising, since two-beam interferometers are highly informative and high-precision instruments, and solving the issue of measurement accuracy has always been an important task for optical instrumentation. The article presents the mechanisms for the formation of an interference signal with a normal and oblique incidence of light radiation on the surface under study. Mathematical expressions are obtained for the existence of a correlation between the scattering fields of various spectral components. It is shown that the measurement accuracy depends on the shape of the resulting interference signal and its stretching in time.