Differential variable reluctance transducer
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United States of America Patent
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-
Mar 5, 1996
Grant Date -
N/A
app pub date -
Jun 21, 1993
filing date -
Jun 21, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The novel differential variable reluctance transducer and telemetry system is comprised of a ultra miniaturized device encased in stainless steel. The system contains a free sliding, magnetically permeable, stainless core and two coils surrounding the core. The position of the core is detected by measuring the coils' differential reluctance. The coils resonate at a frequency which depends on the position of the core and the difference in resonant frequency is used to modulate a high frequency carrier. This radio frequency signal is transmitted for remote reception by an FM receiver, amplified and put through a phase-locked-loop circuit into a microprocessor for counting and displaying.
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