Resistivity measuring apparatus having transmitter and receiver with power level signals
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United States of America Patent
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Mar 14, 2000
Grant Date -
N/A
app pub date -
Mar 16, 1999
filing date -
Mar 16, 1999
priority date (Note) -
Expired
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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.
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