TWO-CHANNEL INTERFEROMETRIC SYSTEM FOR INVESTIGATING SHOCK-WAVE PROCESSES

摘要

FIELD: physics.;SUBSTANCE: device is designed to study elastoplastic and strength properties of materials under intensive dynamic loads. The two-channel interferometric system consists of a source of single-mode coherent radiation, a sample under study, a separation unit of the radiation reflected from the sample under study, two independent optical interferometers constructed using the two-arm VISAR interferometer scheme, and a recording system. Radiation arrives into optical interferometers along a single optical fibre from one point of the surface of the sample under study. The radiation is divided into optical interferometers by a separation unit, which includes a telescope, a polarizing beam splitter, and two rotators. The arms of the interferometers are formed by an unpolarized beam splitter and two mirrors with multilayer dielectric sputtering. Optical interferometers have independent sensitivities (constants VPF1 and VPF2).;EFFECT: creation of a two-channel interferometric system that allows selecting permanent interferometers and the required ratio of VPF1 and VPF2 under experimental conditions for unambiguous recovery of velocity profiles by using two independent channels that process identical data with Doppler frequency shift and effectively use reflected laser radiation.;7 cl, 1 dwg