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AssigneesInstitut Francais du Petrole, Compagnie Generale de Geophysique
InventorsPascal Tierce, Jean Laurent
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The transducer comprises for example a block (1) of sensitive elements such as piled piezoelectric disks held up by a stud bolt between two ferrules and a shell (8) all in one piece, that is arranged around the piling with a concave central part (8A) extended on either side by a solid cylindrical part (8 B, 8 C). Two sleeves are arranged at the two opposite ends of the transducer and elastic elements (14) for decoupling them in relation to the vibrating block (1) are interposed. A flexible housing (18) can be placed around the shell (8) so as to insulate from the outside environment the inner volume of the transducer that can be filled with a fluid such as oil. Connecting means allow the vibrating block to be connected to an exciting voltage source. The transducer can be used for the emission of vibrations at sea or in wells and notably petroleum or gas wells for example.
An electroacoustic transducer comprising at least a vibration generator for generating elastic waves in a frequency range and an impedance transformer mechanically coupled with the generator, including a tubular part located around the vibration generator, defining an inner volume, the tubular part having at least a curved and flexible tubular portion adjacent to at least a solid cylindrical portion, at least the curved tubular portion being provided with openings and an inner volume of the tubular part reinforcing by resonance lowest frequencies in the frequency range generated by the vibration generator.
Dependencies are inferred from the claim text.