Linear displacement transducers utilizing voltage component in phase with current that varies linearly with core displacement
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United States of America Patent
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Sep 4, 1990
Grant Date -
N/A
app pub date -
Feb 21, 1989
filing date -
Apr 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A linear displacement transducer comprises a winding, a magnetic core which is linearly displaceable relatively to the winding, and a source for energizing the winding with a constant RMS alternating current at a frequency sufficiently high for the resistive losses in the magnetic core to cause the voltage across the winding to vary substantially linearly relative to the linear displacement of the magnetic core. The frequency may, for example, be in the range 10 to 20 kHz, and a temperature sensing winding may be associated with the winding to enable the output from the transducer to be compensated for temperature changes, or the winding may be used in time-division multiplex for this purpose.
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