Methods and systems for seismic sensors
AssigneeSchlumberger Technology Corporation
InventorsMasahiro Kamata, Francis Maissant
Life of this patent
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Abstract
Methods and systems for determining coil eccentricity of seismic sensors configured or designed for use in seismic signal detection. A direct electrical current is applied to a moving coil of a seismic sensor such that the moving coil is dislocated from a neutral position relative to the magnetic field in the seismic sensor. A predetermined indicator is measured and eccentricity of the coil (δ) relative to the center of the magnetic filed is determined using the predetermined indicator.
Claims6
A system for determining coil eccentricity of one or more seismic sensor configured or designed for use in seismic signal detection, comprising:
- at least one seismic sensor, comprising:
- a housing;
- at least one magnet for creating a magnetic field mounted within the housing;
- a moving coil mounted within the housing;
- at least one spring assembly connected to the housing and the moving coil for supporting the moving coil for transduction within the magnetic field;
- a digital signal processor in communication with the seismic sensor;
- a set of instructions executable by the processor that, when executed:
- applies to the moving coil of the at least one seismic sensor a direct electrical current such that the moving coil is dislocated from a neutral position relative to the magnetic field in the seismic sensor;
- monitors a predetermined indicator relative to the dislocation of the coil from the neutral position;
- and
- determines eccentricity of the coil (δ) relative to the center of the magnetic filed using the predetermined indicator.
Dependencies are inferred from the claim text.