A BALLISTIC LASER GRAVIMETER WITH INDUCTION-DYNAMIC LAUNCHER FOR SYMMETRICAL MEASUREMENT OF ABSOLUTE VALUES OF GRAVITATIONAL ACCELERATION G

摘要

The invention relates to gravimetry and can be used in ballistic gravimeters for symmetrical measurement of absolute values of gravitational acceleration g. A ballistic gravimeter comprises a vacuum chamber inside which a proofmass with optical corner reflector and disk supporting the proofmass are arranged, and electromechanic launcher of induction-dynamic type. The launcher comprises a coil and armature made as a disk of conducting material. Supporting disk is made as one element with cone director. The shape of cone side walls fit the shape of side walls of guide bevel axial groove of coil inner frame. The coil of induction-dynamic launcher is arranged inside ferromagnetic core. At upper force plate a vacuum chamber is mounted. On external sections of this plate holes enclosing the vacuum chamber are made. Inside the holes upright posts are arranged, those are interconnected with lower force plate. This plate is mounted on massive base. The upright posts are enclosed by helical springs holding upper force plate against lower force plate. A coaxial magnet enclosed by ferromagnetic core is connected to the lower force plate. A cylindrical movable element having upper and lower ferromagnetic sections symmetric about magnet central surface is arranged within central hole of magnet. An optical receiving-emitting device is arranged on tripod mounted on the massive base. The tripod aperture for laser beam is opposite to optical window of the vacuum chamber. The technical result is in improving accuracy of ballistic gravimeter due to reduction of vibrations acting on the receiving-emitting device.