Electric potential sensor
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United States of America Patent
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Sep 11, 2012
Grant Date -
Dec 17, 2009
app pub date -
Feb 13, 2007
filing date -
Mar 21, 2006
priority date (Note) -
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Abstract
The present invention provides an electric potential sensor for the measurement of potentials non-invasively. The sensor comprises at least one detection electrode arranged for capacitive coupling with a sample under test and for generating a measurement signal, and a sensor amplifier adapted to receive the measurement signal as input and to supply an amplified detection signal as output. Input impedance enhancing means are included for providing a high input impedance to the sensor amplifier for increasing the sensitivity of the electrode to reduced electric potentials, and a discrete pre-amplifier stage is arranged to co-operate with the sensor amplifier to reduce the input capacitance of the amplifier.
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