DEVICE TO VISUALISE SPATIALLY INHOMOGENEOUS ACOUSTIC FIELDS FROM MICROOBJECTS

摘要

FIELD: measurement equipment.;SUBSTANCE: invention relates to controlling and measuring equipment and may be used to produce data on structure of acoustic fields in development of acousto-electronic devices, for registration of acoustic fields during physical research of wave processes in acoustics, to control structures in objects, which are not transparent for visible light. Substance; the device comprises an acousto-optical Bragg cell, a source of coherent optical radiation, optical systems for generation of a light beam falling onto a Bragg cell and processing of a light beam diffracted in the cell, and also a device for registration of an object image. The acousto-optical Bragg cell is formed by serially acoustically joined first and second acoustic lines with various values of acoustic waves propagation speed. End coupled surfaces of acoustic lines have a spherical shape of identical radius with a centre of curvature arranged on the longitudinal axis of acoustic lines. At the same time whenever the speed of propagation of an acoustic wave in the first acoustic line is more than the speed of propagation of the acoustic wave in the second acoustic line, the spherical surface of the first acoustic line is arranged as concave, and of the second acoustic line - as convex. And vice versa, if the speed of propagation of an acoustic wave in the first acoustic line is less than the speed of propagation of the acoustic wave in the second acoustic line, the spherical surface of the first acoustic line is arranged as convex, and of the second acoustic line - as concave. The acousto-optical interaction is carried out in the second acoustic line, and the investigated acoustic object is arranged on the flat end surface of the first acoustic line.;EFFECT: production of a bright stigmatic image during visualisation of acoustic fields from microobjects.;2 cl, 5 dwg