MHD sensor for measuring microradian angular rates and displacements
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
Apr 30, 1999
filing date -
Apr 30, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An angular rate sensor which measures submicroradian angular displacements. An MHD sensor is provided having a cylindrical column of conductive fluid, centered about a measurement axis. The magnetic field for the device is generated from permanent magnets and a shunt structure which produces radial magnetic field components through the cylindrical conductive fluid channel. The first electrode contacts an upper end of the cylindrical conductive fluid channel, and a second electrode contacts a lower end of the cylindrical conductive fluid channel. Current produced as a result of an electrostatic potential generated in response to the rotation of the device, flows through a center electrode connecting the first and second electrodes. A transformer winding surrounding the center electrode produces an amplified rate signal from the current flowing between the first and second electrodes.
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