Input/output, Inc.

Texas Instruments Corporation

David M Wilson

Lawrence Philip Behn

Glen Ragan

Xiaolin Lu

Keith Elder

Dale J Lambert

Shu Du

Susan Yim

Peter Maxwell

Allen James Bishop

John C Downey

Eugene D Bednar

Henry Thomas Polk

Michael Arthur Corrigan

Wilfred Bertrand

Jeffrey C Gannon

Byron Cain

John C Downey Jr

Hai T Pham

Jeffery C Gannon

Steven L Roche

Michael George McMahon

A system and method for reducing transmission collisions. In one embodiment, a transmitter for communicating of a smart grid power line network includes an arbiter. The arbiter is configured to select a transmission interval during which the transmitter can transmit. The interval is selected from a plurality of available transmission intervals reserved for contending transmissions, and selected based on a level of a hierarchical network at which the transmitter is located. The interval selected is different from any interval used by a different transmitter spaced two hierarchical levels away from the level of the hierarchical network at which the transmitter is located.

System and method for preventing collisions in a hierarchical network

Method for operating and testing a sensor assembly (). The sensor assembly () preferably includes accelerometers with axes of sensitivity orthogonal to each other. The method preferably includes determining sensor tilt angle, determining the position of the sensor, and synchronizing the operation of the sensor.

Accelerometer transducer used for seismic recording

A plurality of seismic sensors calibration method ( ) includes: an assembling so that sensors are coupled with each sensor positioned with its axis of sensitivity in a different spatial direction calibration system step ( ), a rotating sensors step ( ), a measuring sensors output signals step ( ), a sensor output signal processing step ( ) and a storing calibration coefficient(s) step ( ).

Calibration of sensors

The present invention provides a method and apparatus of acquiring and processing seismic data. One or more controllers are each coupled to seismic sensors and to each other to form a line of data acquisition units. A main controller is coupled to a crossover line unit and to a power supply. Power and data control is distributed among the main controller, the crossover line unit, and each of the plurality of data acquisition units.

Apparatus and method for distributed control of seismic data acquisition

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Missouri City, TX, United States of America

David M Wilson