Differential variable reluctance transducer

Details Differential variable reluctance transducer Differential variable reluctance transducer

1993-06-21

1996-03-05

Peng, John K.

Communications: electrical

Continuously variable indicating

With particular transmitter

34087031, 34087033, 32420715, G08C 1906

Patent

active

054971470

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.

REFERENCES:
patent: 3543145 (1968-04-01), Dufayet
patent: 3654549 (1972-04-01), Maurer et al.
patent: 3756081 (1973-09-01), Young
patent: 4121185 (1978-10-01), Genz
patent: 4350954 (1982-09-01), Seilly
patent: 4623840 (1986-11-01), Fujimura et al.
patent: 4667158 (1987-05-01), Redlich
patent: 4813435 (1989-03-01), Arms

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