Apparatus for measuring resistivity of an earth formation...

Details Apparatus for measuring resistivity of an earth formation... Apparatus for measuring resistivity of an earth formation...

G - Physics

01

V

G01V 3/24 (2006.01) G01V 3/20 (2006.01)

Patent

CA 2166919

An apparatus for measuring resistivity of an earth formation. The apparatus includes at least one source of measuring current. The source includes a delta-sigma modulator and a serial bit source. The serial bit source represents the magnitude of the measure current at spaced apart time intervals. The apparatus includes a sensor responsive to formation current resulting from interaction of the measure current with the earth formation. The sensor is coupled to a sigma-delta modulator and a digital filter. The output of the digital filter corresponds to the magnitude of the measure current detected by the sensor.

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