Single coil conductance measuring apparatus
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Jun 29, 1999
filing date -
Jun 29, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A conductance sensor uses a high impedance feedback oscillator to drive a single coil at the natural resonant frequency of the coil coupled to a measured material. The amplitude of the driving signal is also feedback controlled. The error signal of the amplitude control yields a measurement of resistance of the measured material. The combination of frequency adjustment and amplitude control eliminates non-resistance impedance effects and amplitude-dependent effects allowing high precision, high sensitivity measurement.
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