ELECTROMAGNETIC ACOUSTICAL TRANSDUCER Russian patent published in 2005 - IPC

FIELD: measuring engineering.

SUBSTANCE: transducer comprises housing, substrate, cover, connectors, concentrators, inductive coils, and magnetic system made of permanent magnets. The magnetic system is made of three permanent magnets mounted inside the housing in parallel to the plane of the substrate and tightly pressed to each other. The polarization of the side magnets is arbitrary, and the central magnet has vertical polarization. The surface of the central magnet that faces the substrate is provided with concentrators which are arranged with a spaced relation to each other. The concentrators are made of carbonyl iron and impregnated with a glue. The coils and concentrators are glued to the ceramic plate mounted in the same plane as the bottom base of the substrate and are filled together with it with an epoxy resin. The plate made of a ferromagnetic material is mounted on the surface of the magnets from the opposite side.

EFFECT: enhanced sensitivity of the transducer.