SIMULATOR OF FISH SOUNDS Russian patent published in 1998 - IPC

FIELD: fish industry. SUBSTANCE: simulator has resonator 12 which is made in the form of hollow hermetically sealed cylinder and which is fastened coaxially with calibrated hole 10 in radiating head-piece 9 by means of rigid connector 11. Proportioned release of air is effected by means of relief passage 7 and piston 5 which is movable in passage 4 of head-piece and is closing one of holes in relief passage 7 during compression stroke of spring 6. Control of spectrum of radiating signals depending on dimensional composition of fish run is carried out by means replaceable radiating heads, resonators of various volume and rigid connection of adjustable length. Simulator can be used for creation of artificial concentrations of fish in fishing zones and elsewhere within water area. Simulator ensures similarity of spectrum of emitted sounds and biological signals produced by fish of various dimensional composition. It reduces amount of compressed air needed for operation due to creation of continuous self-sustained vibrations in system of air stream - resonator and approximation of working parameters of simulator and natural emitter. EFFECT: higher efficiency. 1 cl, 3 dwg