IMPLOSIVE SOURCE FOR UNDERWATER PROFILING Russian patent published in 2013 - IPC G01V1/00 

FIELD: physics.

SUBSTANCE: device includes: a hollow housing rigidly mounted in the bottom recess of an underwater floating vehicle, the top part of said housing having an axial hole for passage of a piston rod for cleaning the implosive chamber. The chamber is formed by an axial hole in the housing, a casing rigidly mounted in the bottom part of the housing and a bottom cover rigidly mounted in the bottom part of the casing. Windows of the chamber are made in the bottom part of the housing. The cleaning piston is composite. Its top part is rigidly mounted and tightly connected to a rod. The bottom part of the piston is mounted by a hollow sliding piece which is sealed with respect to the inner hole of the top part of the piston, the sliding piece being limited in back and forth movement by an inner shoulder in the hole of the top part of the piston. A spring-loaded clamp is rigidly attached to the bottom part of the piston inside a through-hole with possibility of interaction with a support on an axial cavity in a head which is freely mounted in the bottom part of the chamber. The axial hole of the housing, where the piston moves freely, has two rows of drainage radial holes linking it with the surrounding space: a top row at the top end of the hole, a bottom row above the windows themselves. The implosive chamber is covered at the bottom by a blind bottom with a check valve which allows liquid into the surrounding space, and has four longitudinal windows in the top part. The chamber is covered on its entire length by a reflector which forms a passage annular section whose area is not less than the cross-sectional area of the piston. The reflector is rigidly attached to a depression on the housing above the windows. The movable connection of the cleaning piston and the housing is sealed. The top part of the rod is rigidly attached to the bottom bearing of a long toggle link which is turned through a flexible coupling by a gear motor. A head is freely mounted inside the chamber under the cleaning piston with a large radial gap. The windows of the chamber are in an open position when all parts of the piston are in uppermost position.

EFFECT: achieving a continuous process of transmitting seismic pulses with the required frequency in the immediate vicinity of the bottom during underwater seismic profiling.

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