| 摘要 |
An uncomplicated, easy to operate, relatively inexpensive, compact and powerful acoustical source hydro gun for use in a liquid environment is particularly effective in a multiple array for marine life management. The powerful output, compactness and non-complex features of this hydro gun enable its advantageous use as a seismic energy source for high resolution marine seismic exploration and for seismic exploration when lowered down into a well in the earth containing liquid. A cylinder containing a free-moving piston has water discharge ports near one end for admitting water when the hydro gun is immersed in water and for discharging water when the hydro gun is activated by a solenoid valve. The solenoid valve is mounted on a cylinder head block containing a small annular high pressure firing chamber charged with pressurized gas and closed by the solenoid valve. To fire this hydro gun, the solenoid valve is electrically energized, thereby opening a short flow path from the firing chamber into the head end of the cylinder. The sudden discharge of high pressure gas into the cylinder head end propels the water piston along the cylinder for suddenly discharging water through the discharge ports. The water piston blocks these ports thereby creating a cavity in the ambient liquid which collapses to produce a wideband frequency sharply-peaked pressure impulse rich in frequencies above 300 Hz. Hydrostatic pressure automatically returns the piston to its initial position at the cylinder head end.
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