Sercel Australia Pty. Ltd.

Compagnie Generale De Geophysique

Francois Luc

Robert Dowle

The apparatus has a sensor disposed on the first end of an elongate connector by means of fixed interface link. A recorder unit is disposed on the second end of the connector opposite the first end. The connector is bendable within a predefined curvature range. When the apparatus is deployed into the sea, it is adapted to free-fall through the body of water and to land on the seafloor such that the sensor is spaced apart from the recorder unit. The apparatus is additionally adapted to substantially vibrationally de-couple the sensor from the recorder unit. The length of the connector is dynamically variable within a predefined range so as to minimize vibration coupling between the recorder unit to the sensor. Physical separation of the sensor and the recorder unit, together with the mechanical characteristics of the connector, ensure that the sensor is substantially vibrationally de-coupled from the recorder unit.

Underwater sensor and data sensing and recording apparatus

A method for compensating the effect of gravity on seismic sensors such as geophones and a gravity effect-free seismic sensor are disclosed. The gravity effect-free seismic sensor of the present invention includes primary sensor () operatively responsive to seismic movements and hence generating a seismic signal by having a coil placed in a magnetic field in a first axis of sensitivity (); an auxiliary sensor () operatively responsive to a gravity field for generating a tilt signal, thus provide current to the coil of the primary sensor () to induce a force on the coil that at least partially compensates for a weight of the coil, thus ameliorating or eliminating a gravity effect on the primary sensor ().

Seismic sensors

A method for deploying and retrieving seafloor equipment modules is disclosed. A conveyor has a fixed end and a free end. The conveyor is deployed into a body of water until the free end reaches, or is proximate to, the seafloor. The conveyor is dragged through the water. The equipment modules are slidably attached to the conveyor. The equipment modules slide along the conveyor to the seafloor, where the equipment modules engage the seafloor and are secured at a fixed position.

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Sydney, Australia

Francois Luc