Sensor for non-contacting electrostatic detector
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United States of America Patent
Stats
-
Jun 3, 2003
Grant Date -
Feb 27, 2003
app pub date -
Aug 24, 2001
filing date -
Aug 24, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensor for an electrostatic detector including an elongated vibratory element supported at a mechanical node at one end in the manner of a cantilever beam, a sensitive electrode on the vibratory element near the other end and adapted to be disposed toward an electrical charge, field or potential being measured, and a driver transducer on the vibratory element for vibrating the element in a direction to vary the capacitive coupling between the electrode and the electrical charge, field or potential being measured. The driver transducer is at a location along the beam and is operated at a vibratory frequency such that a virtual mechanical node appears along the beam. This, in turn, reduces vibration at the mechanical attachment node so that the degree of stiffness of the mechanical node does not affect the operating frequency and/or the displacement at the free end of the cantilever.
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