Study of the Possibility of Creating a Method for Calibrating Fiber VISAR Based on the Effect of Stimulated Mandelstam-Brillouin Scattering
The presented work is aimed at solving the problem of creating a universal method for calibrating laser-optical measuring systems and expanding the operating range of measured velocities. The paper presents the results of estimates and experimental studies of the influence of nonlinear optical effects based on stimulated light scattering in optical fibers on the characteristics of Doppler laser diagnostic systems of the VISAR type. The principle of operation of the device being created is based on the occurrence of a nonlinear effect of stimulated Mandelstam-Brillouin scattering under the influence of laser radiation in optical fibers. As a result of the work performed, based on the consideration of the parameters of the nonlinear effect in optical paths under various conditions, the concepts of the method for calibrating measuring complexes of the VISAR type were formulated, which are successfully used in gas-dynamic experiments in conjunction with other instrumentation and technical means.