Inductive sensor for detecting displacement of adjacent surfaces

Details Inductive sensor for detecting displacement of adjacent surfaces Inductive sensor for detecting displacement of adjacent surfaces

1987-10-28

1989-03-28

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324233, 324236, 331 65, 34087032, G01B 730, G01B 714, G01R 3300

Patent

active

048167592

ABSTRACT:
An inductive displacement sensor includes an oscillator circuit that is characterized by primary and secondary pairs of coils disposed on opposing surfaces of adjacent optical segments. Each coil in both coil pairs is alternately positioned along a respective axes perpendicular to a segment displacement axis. The secondary coils are respectively tuned to frequencies above and below the oscillator circuit resonant frequency. Any motion between segments along the displacement axis induces a detectable change in phase between the current and voltage of the oscillator signal.

REFERENCES:
patent: 2438197 (1948-03-01), Wheeler
patent: 3500373 (1970-03-01), Minasy
patent: 3526886 (1970-09-01), Lubich
patent: 3721821 (1973-03-01), Blanyer
patent: 4618822 (1986-10-01), Hansen
patent: 4638250 (1987-01-01), Shen-Orr et al.
patent: 4663589 (1987-05-01), Fiori

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