Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1993-12-03
1995-01-24
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367174, 367180, 367154, 367 20, 181122, H04R 1700
Patent
active
053847539
ABSTRACT:
A self-orienting seismic detector for detecting vertical acceleration regardless of the device's horizontal orientation. The detector comprises a housing fitted with diaphragms capable of generating signals. A mass is internally suspended within the housing between the diaphragms by means of a filament which is connected at each of its ends to one of the diaphragms. Vertical motion of the detector causes internal displacement of the mass within the housing. Motion by the mass within the cylinder is translated by the filament to the diaphragms which generate signals which may then be recorded. The detector may be incorporated within or attached to an undersea cable to form a seismic detection system primarily suitable for placement on an ocean bottom, but which may be employed in a towed array. In a primary embodiment, the detector is sealed from external pressure changes such that the stresses placed upon the detector's diaphragms will be governed by particle acceleration changes rather than pressure changes. In an alternative embodiment, the detector is exposed to external pressure. In this embodiment, the detector acts as a dual sensor-type system, incorporating the data gathering features of both a geophone and a hydrophone.
REFERENCES:
patent: 3911388 (1975-10-01), Crump et al.
patent: 4322829 (1982-03-01), Davis, Jr. et al.
patent: 4928263 (1990-05-01), Armstrong et al.
patent: 5128905 (1992-07-01), Arnott
Eldred J. Woodrow
Western Atlas International Inc.
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