Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Comparative Assessment of Methods Settings of Interference Fringes in Phase Measuring Systems E.E. MAIOROV, A.S. USHAKOVA, A.V. DAGAEV, A.A. KONSTANTINOVA, E.A. YAKOVLEVA, V.B. KOSKOVICH, A.A. SOROKIN, V.P. PUSHKINA, R.A. KOVALENKO The article compares two ways to configure interference fringes were conducted. The influence of the reference beam deviation from its initial propagation direction on the measurement accuracy as a criterion of comparative evaluation was chosen. In classical holographic interferometry, when using two reference sources, a quantitative assessment of the measurement error that occurs when one of the reference (restoring) beams deviates from its original direction was obtained. The deviation of one of the reference beams by an angle of about 10–5 radians will lead to a phase attack of the object wave by the value of 0,22 shares of the interference fringe was determined. The use of a shear interferometer to adjust the interference fringes it possible to implement the principle of heterodyne interferometry using only one reference beam was made. The quantitative estimation of the error arising at the same time was given. The phase foray must be determined on the length of the displacement vector of identical elements of the surface of the object was revealed. The use of the shift interferometer for the implementation of the principle of heterodyne interferometry, as well as for the adjustment of interference fringes, in comparison with the two-support holographic interferometry allows the use of only one reference beam and, ceteris paribus, increases the accuracy of measurements by two orders of magnitude δ φ = 2π ˑ 0,22 ˑ 10–2 was shown. Keywords: heterodyning, interferometer, holography, the reference beam, the phase foray, aperture. DOI: 10.25791/pribor.02.2020.1153 Pp. 52-57.