Resistivity measuring apparatus having transmitter and receiver

Details Resistivity measuring apparatus having transmitter and receiver Resistivity measuring apparatus having transmitter and receiver

1999-03-16

2000-03-14

Do, Diep N.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324683, 324709, 324639, G01N 2702, G01K 2702

Patent

active

060377844

ABSTRACT:
Material resistivity measuring apparatus includes a transmitter for transmitting a measurement frequency current through the material to a receiver spaced from the transmitter. The transmitter includes a power amplifier wherein the measurement frequency current is amplified in discrete steps depending upon resistivity of the material. The current level of the transmitter is transmitted to the receiver by modulating the measurement frequency current by a modulation signal whose phase is indicative of power level. The measurement frequency current can be modulated by a second modulating signal which provides a reference phase for the first modulating signal.

REFERENCES:
patent: 4220915 (1980-09-01), Kawamoto et al.
patent: 5136252 (1992-08-01), Witt
patent: 5386196 (1995-01-01), Jones et al.
patent: 5428296 (1995-06-01), Champagne et al.
patent: 5570030 (1996-10-01), Wightman
patent: 5841282 (1998-11-01), Christy et al.
Geometrics OhmMapper--Resistivity Mapping.TM.--first distribution in Feb. 1999.
V.M. Timofeev, (Vsegingeo, Moscow, Russia), "Electric and Electromagnetic Profiling With Ground Capacitive Line-Antennas"--paper presented at a seminar in USSR or in Russia, in or about 1995.

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