Method and apparatus for measuring D.C. and A.C. voltages using non-contacting sensors
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United States of America Patent
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Sep 17, 2002
Grant Date -
N/A
app pub date -
Nov 8, 2000
filing date -
Nov 8, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for performing non-contacting measurements of the voltage of a conductor includes a conducting membrane coupled to a transducer. The membrane is driven with an A.C. reference voltage, creating alternating attractive and repulsive electrostatic forces caused by the difference in potential between the membrane and the conductor. The transducer generates a signal having the same frequencies as the forces on the membrane, and the amplitudes of the A.C. components are proportional to the unknown voltage on the conductor. By dividing the amplitude of the A.C. components, an accurate determination of the unknown voltage is calculated A plurality of membranes and transducers may be arrayed to provide an image of multiple voltage readings. In addition, it is also possible to measure A.C. and D.C. voltage on the center conductor of an insulated wire without the need to pierce the insulation.
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