Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1981-12-18
1985-10-15
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324 83D, 324 79D, 324341, 307516, 328133, G01V 324, G01R 2514, H03D 1300
Patent
active
045477337
ABSTRACT:
An electromagnetic logging apparatus for investigating properties of an earth formation surrounding a borehole comprises an electromagnetic energy transmitter and four receivers supported by a support member, a measurement channel, and a multiplexer for selectively coupling the measurement channel to the receivers. The measurement channel comprises an amplitude processing channel including a highly gain-stabilized amplifier and gain control circuit; a phase processing channel including a highly phase-stabilized amplifier; and a circuit for measuring the amplitude and phase. The gain of the gain-stabilized amplifier is controlled by the gain control circuit in a closed loop feedback arrangement, while the gain of the phase-stabilized amplifier is controlled by the same gain control circuit without the closed loop arrangement. Phase is detected in the phase processing channel by a zero crossing detector and a mode detector, and is measured in the amplitude and phase measurement circuit by a rising edge detector, a falling edge detector, and means for determining a phase value. Amplitude is detected in the amplitude processing channel with an amplitude detector. A related electromagnetic logging method is disclosed.
REFERENCES:
patent: 3849721 (1974-11-01), Calvert
patent: 3944910 (1976-03-01), Rau
patent: 4052662 (1977-10-01), Rau
patent: 4100483 (1978-07-01), Thompson et al.
patent: 4107598 (1978-08-01), Meador et al.
patent: 4130793 (1978-12-01), Bridges et al.
patent: 4185238 (1980-01-01), Huchital et al.
patent: 4209748 (1980-06-01), Huchital
Dranetz Engr. Lab. Inc., "Applications Handbook of Precision Phase Measurement", 1975, pp. 1-2.
Hewlett-Packard Co., "Section IV: Theory of Operation", Model 3575A, Gain Phase Meter Service Manual, 6/1976, pp. 4-1-4-16.
Carroll David H.
Schlumberger Technology Corporation
Snow Walter E.
Strecker Gerard R.
LandOfFree
Amplitude and phase measurement in electromagnetic logging does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Amplitude and phase measurement in electromagnetic logging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplitude and phase measurement in electromagnetic logging will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2431958