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Ocean bottom floor hydrophones and seismometers

A technology for hydrophones and low-frequency sound waves, which is applied in the field of submarine hydrophones and geophones, and can solve problems such as large volume, high cost, and impracticality

Inactive Publication Date: 2005-11-30
法国海洋开发研究院(工商性公共研究会)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The main drawback of these devices is that they are bulky and costly due to the complexity of having various components
It is unrealistic to assume the cost and space required for existing workstations

Method used

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  • Ocean bottom floor hydrophones and seismometers
  • Ocean bottom floor hydrophones and seismometers
  • Ocean bottom floor hydrophones and seismometers

Examples

Experimental program
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Embodiment Construction

[0025] One embodiment of the submarine seismic station according to the present invention is represented at figure 1 and 2 middle. figure 1 Provides a cross-sectional schematic of the workstation, while figure 2 is its top view. The station designated by reference number 1 has: a glass ball 2 placed in a protective casing 3 made of plastic, a ballast 4 connected to the protective casing by a plastic rope 5, and a hydrophone mounted on the outside of the protective casing Device 6. The assembly formed by the protective shell 3 + glass sphere 2 has positive buoyancy and forms part of the station to be recovered on the water surface after the measurement period.

[0026] The glass bulb 2 is hollow and able to withstand the hydrostatic pressure at the depths used, which can reach depths of about 6,000 metres. It consists of two hemispheres with touching edges that join together when the inside of the sphere is evacuated. It includes means 7 for processing signals from hydro...

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Abstract

The invention concerns an ocean bottom station, such as an ocean bottom hydrophone (OBH) or an ocean bottom seismometer (OBS), designed to perform in situ measurements, comprising a support structure (2, 3) with positive buoyancy wherewith is associated at least one detachable ballast (4) to bring said support structure to the ocean bottom during a measurement session, the support structure including at least one hydrophone (6), one data acquisition unit (7) for recording measurement data from the hydrophone and a device for releasing said detachable ballast. The invention is characterized in that the data acquisition unit (7) serves to control the releasing device in response to an acoustic release command received by the hydrophone (6).

Description

technical field [0001] The invention relates to equipment of the type comprising hydrophones and associated data acquisition means, designed to be placed on the seafloor during measurements and then recovered on the surface. It particularly concerns devices known as ocean bottom hydrophones (OBH-ocean bottom hydrophone) and ocean bottom seismometers (OBS-ocean bottom seismometer). Background technique [0002] Such devices are used in methods for the exploration of the deepest layers of the earth's crust, especially in relation to oil exploration. The device is placed on the ocean floor and emits sound waves from the surface at regular intervals. The recorded seafloor response to this acoustic wave is used to determine the placement and resolution of formations, eg, their properties. Measured data can also be used to determine past and predict future developments. [0003] Undersea hydrophones (OBH) are used to record sound waves propagating from the water surface into th...

Claims

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Application Information

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IPC IPC(8): G01V1/38
CPCG01V1/38
Inventor 伊夫·奥弗雷帕斯卡尔·佩洛
Owner 法国海洋开发研究院(工商性公共研究会)
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