| 摘要 |
<p>A torpedo-shaped underwater seismic gun adapted to deliver an acoustic pulse to a submarine earth surface consists of an aft main body section and a separable forward nose section supported beneath a float in a submerged position in any desired offshore location. An axial connecting rod joins the nose section to a piston slidable within a sealed cylindrical bore extending partially along the main body section, both sections being free of external constraints on relative longitudinal movement thereof other than the resistance of the water. An air spring in the cylindrical bore behind the piston urges the main body section and the nose section together to form an interface between respective transverse external surfaces thereof. Ignition of an explosive gas mixture in front of the piston in the cylindrical bore drives the piston and the main body section in opposite directions to separate these two sections rapidly, thereby creating a low pressure bubble of condensable water vapor between the two external surfaces. Implosion of this bubble responsive to hydrostatic pressure generates a singular seismic pulse having a peak pressure on the order of 104 atmospheres.</p> |
