PERFECCIONAMIENTOS INTRODUCIDOS EN UNA FUENTE SISMICA SUBMARINA PARA USO EN UNA MESA DE AGUA.

摘要

A subsea seismic source comprises a gas gun using a compressed gas such as air to produce an underwater pulse during seismic prospecting for gas or oil. The gun is designed so that the size of gas holding chamber (40) contained therein may be varied from a remote location such as the seismic vessel (10). The source desirably uses a hydraulic servo valve (62) under electrical control (stepper motor 74) having mechanical feedback to a piston (60) on the gas holding chamber (40) to control the volume of the gas holding chamber.