Method of making a seismic apparatus

Details Method of making a seismic apparatus Method of making a seismic apparatus

1980-03-31

1982-06-29

Hall, Carl E.

Metal working

Piezoelectric device making

367163, H01L 4122

Patent

active

043366392

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: 3970878 (1976-07-01), Berglund
patent: 4051455 (1977-09-01), Fowler

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