Method and apparatus for diagnosing faults in the geophone...

Details Method and apparatus for diagnosing faults in the geophone... Method and apparatus for diagnosing faults in the geophone...

G - Physics

01

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324/58.01

G01V 1/22 (2006.01) G01R 31/08 (2006.01) G01V 1/20 (2006.01) G01V 13/00 (2006.01)

Patent

CA 1056911

ABSTRACT OF THE DISCLOSURE METHOD AND APPARATUS FOR DIAGNOSING FAULTS IN THE GEOPHONE GROUP OF A GEOPHYSICAL DATA ACQUISITION SYSTEM This invention relates to a method and apparatus for quick and convenient fault diagnosis of a geophone group- geophone cable complex of a geophysical data acquisition system used in the collection and recording of seismic infor- mation, such faults within each geophone group of such a system being identified, irrespective of the fact that a cable or cable segment is interconnected between the group under test and the fault-testing apparatus of the present invention. Specifically the present invention includes means for driving the complex with a D. C. current of predeter- mined amplitude; means for driving the same complex with an A. C. current of absolute peak amplitude equal to the amplitude of the D. C. current, and means for detecting and measuring the excess of resulting A. C. voltage with respect to D. C. voltage so as to provide a direct measure- ment of the difference between A. C. and D. C. impedance of each geophone group.

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