Abstract: This work is focused on creating multipurpose device for diagnostics of interferometric measuring systems. Operating principle of such device is based on appearing of a nonlinear effect – stimulated Mandelstam-Brillion scattering (SMBS) which appears because of influence of laser radiation in optical fiber. As a result there were conducted investigations of parameters of nonlinear effect in optical paths under different conditions. There were formulated recommendations for designing device and methods for diagnostics of measuring systems such as Photon Doppler velocimetry (PDV), velocity interferometer system for any reflector (VISAR), and Fabry- Perot. The purpose of this work is to determine the technical capabilities of the implementation of the diagnostic method for velocity measuring systems such as PDV, VISAR and Fabry-Perot. For this purpose, in this work, the thresholds for the appearance of the SBS effect were determined, experimental measurements of the spectral shift were carried out, and the ultrasound velocity in various media was calculated from the data obtained.

Keywords: Stimulated Mandelstam-Brillion scattering, nonlinear effects, sonic wave, sound speed, Stokes wave.

.__________________________________________________________________________________________