Communications – electrical: acoustic wave systems and devices – Signal transducers – Receivers
Reexamination Certificate
2011-04-19
2011-04-19
Lobo, Ian J (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Signal transducers
Receivers
C367S013000, C367S182000, C367S183000
Reexamination Certificate
active
07929379
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.
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patent: 7225662 (2007-06-01), Kamata
patent: 7406002 (2008-07-01), Schleisiek et al.
Masahiro Kamata, “An Accelerometer for Seismic Signal Detection”, 6th Conference of Underground and Civil Engineering Acoustic Emission, Japan, Tohoku University, Aug. 25-26, 1999.
Masahiro Kamata, “High Precision Geophone Calibration”, the Japanese Society for Non-Destructive Inspection, the 17th International Acoustic Emission Symposium, Nov. 9-12, 2004, Tokyo, Japan.
Kamata Masahiro
Maissant Francis
DeStefanis Jofy
Griffin Jeff
Lobo Ian J
Right Daryl R.
Schlumberger Technology Corporation
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