Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1981-11-12
1985-05-14
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367165, 367174, H04R 1700
Patent
active
045176647
ABSTRACT:
A seismic streamer section includes a flexible tube with bulkheads at intervals therealong, end means to make electrical and mechanical connections with adjacent sections, tension lines extending from one end means to the other through the bulkheads, hydrophones in the tube between the bulkheads, an electric bundle including through conductors extending from one end means to the other through the bulkheads to various ones of the hydrophone. Each hydrophone comprises a drum shaped case with dished ends and convex sides providing standoff from the bundle and lines for piezoelectric wafers supported inside the ends. A cylindrical metal ring forms the side of the case. Stainless steel cups disposed with their bottoms adjacent and having their rims welded to the rims of the ring form the ends of the case. The piezoelectric wafers are conductively secured one each to the inner surfaces of flexible diaphragms forming the bottoms of the cups. Flat metal discs are conductively secured one each to the mid-portions of the adjacent faces of the wafers. Flexible metal wires are integrally connected one each at one end to the outer peripheries of the discs. The other ends of the wires are inserted into and soldered to a metal tube extending radially through the ring. The tube is ceramically insulated from the ring and sealed thereto fluid tight. The tube may be bonded in place to the ring. The metal discs are separated by a distance equal to the sum of the permissible maximum inward displacements of the wafers. An elastomeric bumper may surround the ring.
REFERENCES:
patent: 2976434 (1961-03-01), Henry et al.
patent: 3376948 (1968-04-01), Morrow
patent: 3518677 (1970-06-01), Florian
patent: 3660809 (1972-05-01), Pearson
patent: 3696329 (1972-10-01), Hazelhurst
patent: 3885286 (1975-05-01), Hill
patent: 3970878 (1976-07-01), Berglund
patent: 4296481 (1981-10-01), Weiss
Issing Gregory
Moskowitz Nelson
Teledyne Exploration Company
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