Process and a device for hydrodynamic sound pulse generation in a liquid

US4811815A · kind A · utility

Assignee

• 501 Max-Planck-Gesellschaft zur Forderung der Wissenschaften E.V. · DE

Inventors

• Gerd Meier · Oettingen, DE
• Andreas Laake · Irishtown, GB

Key dates

• Filing date: Feb 27, 1987
• Grant date: Mar 14, 1989
• Expiry date: Feb 27, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S181/402
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A process and a device for hydrodynamic sound pulse generation in a liquid, n particular for sound pulse generation at sea for marine geophysics measurements. In an pipe (1), open on one end, which surrounds a liquid column of a specific length and which makes contact with the liquid at the end of the liquid column opposite the open end (2) of the pipe, the end of the liquid column opposite the open end (2) of the pipe is struck in bursts by an axial compressive force, either with the liquid column being accelerated in the direction opposite the open end (2) of the pipe and subsequently being decelerated at its end opposite the open end of the pipe, for example, by a piston (5) which is accelerated together with it and which strikes a stop (6), or with the liquid column being abruptly hit on the end opposite the open end (2) of the pipe by an auxiliary mass, previously accelerated in the direction of the open end of the pipe and abruptly decelerated in such a way that a sound pressure pulse is generated at this end of the liquid column through the abrupt acceleration; this pulse is transmitted in the liquid column to the open end (2) of the pipe and from there is radiated, on the o…