Sensor apparatus and method
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[0047]Referring to the figures, a seismic survey across a “prospect” or terrain of interest is conducted by positioning a number of sensor units 1 at known locations, typically in a regular array.
[0048]One possible application is in ocean bottom cable (OBC) systems and shallow water operations for 3D and 4D seismic acquisition. FIG. 1 shows the sensor units 1 in use in an OBC operation in which sensor units 1 are lowered by cable 2 from a recording vessel 3 to sit on the seabed 4. In such use it is of course necessary to enclose the sensor units 1 in a watertight casing and to use communication means such as electronic or optical transmission via the suspension cable 2 to collect data. The sensor units 1 are also of use in land based operations.
[0049]FIG. 2a illustrates an individual sensor unit 1 which may be used in the survey of FIG. 1. For simplicity, interconnections and internal electronics of the unit 1 are not shown. This sensor 1 includes three orthogonally disposed acceler...
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