Measuring and testing – Instrument proving or calibrating – Speed – velocity – or acceleration
Reexamination Certificate
2001-11-14
2004-07-06
Raevis, Robert (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Speed, velocity, or acceleration
Reexamination Certificate
active
06758080
ABSTRACT:
BACKGROUND OF THE INVENTION
The present disclosure relates generally to a method of calibrating a plurality of sensors, and in particular to a three-axis sensor.
In deploying sensors, calibration coefficients are used to correct the sensors for variations or errors in gain, offset, non-linearity, misalignment of the proof masses, cross-axis coupling, temperature, or other environmental factors and to provide more accurate seismic data. Some limitations of current calibration methods include no automatic calibration, no conversion of data to internationally accepted scientific units, no permanent storage of the data, and no universal usage by any and all seismic software.
The present invention is directed to overcoming or at least minimizing some of the limitations of the existing methods of calibrating sensors.
SUMMARY OF THE INVENTION
According to one aspect of the invention, a method of calibrating a plurality of seismic sensors, each sensor having an axis of sensitivity, is provided that includes: coupling the sensors with each sensor positioned with its axis of sensitivity in a different spatial direction; rotating the sensors; measuring one or more output signals from the sensors; processing the output signals from the sensors; and storing one or more calibration coefficients.
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IEEE Std. 337-1972; IEEE Standard Specification Format Guide and Test Procedure for Linear, Single-Axis, Pendulous, Analog Torque Balance Accelerometer; Dec. 2, 1971 (pp. 8-53).
Gannon Jeffrey C.
Pham Hai T.
Ragan Glen
Wilson David
Input / Output Inc.
Madan Mossman & Sriram P.C.
Raevis Robert
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