Hydrophone

US5394379A · kind A · utility

Assignee

• Prakla-Seismos GmbH · DE

Inventors

• Helmut Weichart · Hannover, DE
• Manfred Technau · Laatzen, DE

Key dates

• Filing date: Aug 4, 1993
• Grant date: Feb 28, 1995
• Expiry date: Aug 4, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49005
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A hydrophone for a marine seismic streamer has a pressure sensor with outer membrane surfaces on which piezoelectric sensors (4, 5) are secured. The pressure sensor is formed from two spaced steel disks (1, 2) having recesses directed toward one another and which are laser-welded at the edges in a gas-tight manner. The pressure sensor is electrically insulated from its external environment by a synthetic resin coating, which may enclose the entire pressure sensor, including the connecting wires. A method of making the hydrophone is also disclosed. The hydrophone can be manufactured so as to be small in dimensions and weight, is mechanically sturdy and capable of withstanding overload, as well as being protected by the synthetic resin coating against short circuiting and corrosion.