Geosource, Inc.

Harco Corporation

Mitchell F Peterson

Charles R Ferry

C Ernest Wales

A method and apparatus for generating a nonlinear sweep signal to be supplied to a seismic vibrator. A seismic sweep time is determined and is divided into a plurality of preselected time intervals. The rate of change of the frequency is determined for each of these time intervals to generate an output signal of a desired shape. The rate of change of the frequency for each time interval is calculated in response to the starting frequency of the sweep, the range of the sweep, the sweep time, and the desired shape of the output signal. The rate of change is supplied to a frequency generator which generates a signal to be supplied to the vibrator.

Method and apparatus for seismic exploration using non-linear sweeps

Method and apparatus for determining the true cathode polarization potential for automatically regulating the impressed current in a cathodic protection system.

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Houston, TX, United States of America

Mitchell F Peterson