PNEUMATIC SOURCE FOR SEISMIC SIGNALS Russian patent published in 1994 - IPC

FIELD: seismic survey. SUBSTANCE: compressed air is fed into hollows 25 and 38 of solenoid-operated pneumatic valve and passed into control chambers 8 and 9. Then working chambers 15 and 21 are sealed and compressed air is fed from control chamber 8 into working chamber 15 and further through process chamber 16 and hollow 24 into working chamber 21. After first emitter has operated, compressed air is discharged from working chamber 15, while air in hollow 24 and working chamber 21 is additionally compressed with the use of pressure in process chamber 16 and with the aid of stepped piston 11. Second emitter is operated after at least one operation of first emitter. EFFECT: improved seismic efficiency due to successive excitation of vibrations in different ranges of frequency spectrum. 1 dwg