Seismic detector
AssigneeCompagnie General de Geophysique
InventorJean A. Rudaz
Life of this patent
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Abstract
A seismic detector comprises a casing the lower part (10) of which is provided with a plurality of apertures (19). A hydrophone transducer (70) comprising an annular ceramic member provided with metallized surfaces (71,72) is mounted in the casing and defines with the casing an enclosure (65) which houses a geophone (60). The outer face (71) of the hydrophone transducer (70) is subject to the ambient hydrostatic pressure via the apertures (19). The bottom of the casing is provided with a protuberance (11) to which a spike (12) is attached. The seismic detector can work in both hydrophonic and geophonic modes.
Claims10
A seismic detector, comprising:
- a casing having a hollow upper part and a hollow lower part;
- a spike connected to said lower part;
- a geophone mounted in said lower part in a position surmounting the connection for said spike;
- at least one passage formed in said upper part through which electrical connections extend to the outside of said housing casing;
- perforations formed in said lower part to form a grating through said lower part;
- and
- a hydrophone transducer comprising a generally cylindrical ceramic member having metalized faces, said hydrophone transducer being disposed inside said lower part in opposing relation to said perforation and in a position surrounding said geophone, said hydrophone transducer being water-tightly sealed against said casing so as to seal said hollow lower part against ingress of water and such that an outside face of said hydrophone transducer is subjected through said perforations to ambient hydrostatic pressure while an inside surface of said hydrophone transducer is subjected to pressure inside said casing which contains said geophone.
Dependencies are inferred from the claim text.