ELECTROMAGNETIC-ACOUSTIC TRANSDUCER Russian patent published in 2012 - IPC G01N29/04 

FIELD: physics.

SUBSTANCE: magnetic system is in form of three permanent magnets, one central and two lateral permanent magnets which tightly adjoin the lateral sides of the central permanent magnet and to a substrate and said magnets are inside a solenoid which is connected to a direct current source, wherein the central permanent magnet is maximally close to the top surface of a concentrator, or the magnetic system is in form of one central permanent magnet or one ferromagnetic steel core with high remnant magnetisation, which perform the role a magnetic flux concentrator, inside a solenoid which is connected to a direct current source and is adjacent to the concentrator of an additional magnetic system, which is in form of at least two pairs of permanent magnets with opposite polarity and different degree of magnetisation, which are arranged crosswise on a rotating disc made from nonmagnetic material, wherein the additional magnetic field formed by the concentrator in operating mode has a direction which coincides with the direction of the field formed in operating mode by the magnetic system, part of the ceramic plate directly adjacent to inductance coils is in form of a layer of ceramic formed on the surface of the substrate facing the surface of the control object by sputtering, which deposited on all of the remaining surface of the substrate in which together with the layer of ceramic, there are holes for outlet of compressed air which feeds the "air cushion", each dielectric plate directly adjacent to the inductance coils additionally contains not less than two support elements lying in the zone of the inductance coils.

EFFECT: possibility of rapid control of the main operating flux generated by permanent magnets in the zone of a concentrator.

5 cl, 6 dwg