A device for generating elastic waves focused in a medium such as the material under - ground, and method for implementing it.

摘要

- electromechanical device for generating the elastic waves in a medium, such as the - ground and a method for its implementation. - the device comprises one or several vibrators adapted to be buried in the medium, which is associated with a control system. Each vibrator comprises at least a mass of inertia (1), a plurality of plates (2, 3) ensuring the mechanical coupling with the medium, of the electromechanical transducers (4, 5) connecting the inertia masses (1) to the plates (2, 3). The control system (7) is adapted to be applied to the various transducers (4, 5), the respective control signals such as the field of elastic waves resulting generated in the medium by the device, or oriented preferably in one or several directions. This field of waves focused can be obtained directly by application of appropriate control signals to the various transducers of each vibrator or else by proceeding in several successive transmission time, with wave fields, such that, by a combination of the seismograms obtained during these various time, the field of waves which is equivalent to be focused, or by combining the fields of focused wave emitted by several vibrators simple. - applications of the land seismic prospecting, for example.