SEISMIC SIGNALS PNEUMATIC SOURCE Russian patent published in 1994 - IPC

FIELD: sea seismic prospecting. SUBSTANCE: device has case 1 and locking tool 3 with internal flange 4, working and control chambers 5 and 6 correspondingly. Damping chamber 7 is formed by case 1 and internal flange 4 of locking tool 3. Control chamber 6 is connected with flow capacitance through pressure adjusting unit 13. Compressed air is fed into cavity 11 of electric pneumatic valve 10 and then to pressure adjusting unit 13 and to operating chamber 5 through channel 12. Air inerts operating chamber 6 from unit 13. In chamber 6 pressure reaches the value being higher, than hydrostatic one, but lower, than in cavity 11. After command current pulse is applied to coil of electric pneumatic valve 10, start channel 16 should be opened. Compressed air streams into starting volume 17 and when acting on edge of locking tool 13, shifts it up. In this case compressed air is thrown into water medium from operating chamber 5 and excites seismic signal. Locking tool 3 returns to initial position under effect of air pressure of control chamber 6. EFFECT: improved seismic efficiency.