Displacement transducer with opposed coils for improved linearit

Details Displacement transducer with opposed coils for improved linearit Displacement transducer with opposed coils for improved linearit

1988-01-22

1989-09-12

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324225, 336 45, 34087031, G01B 714, G08C 1912, G08C 1902, H01F 2102

Patent

active

048663786

ABSTRACT:
The relative displacement of two bodies is measured by moving an electrically conducting, non-ferromagnetic wall means in proportion to the relative movement of the bodies in order to increase its overlapping, telescoping relationship to a first current conducting coil while simultaneously decreasing its overlapping, telescoping relationship to a second current conducting coil. Each of the coils are excited with an AC signal at a frequency which is at least high enough that the skin depth of the wall means is less than the physical depth of the wall means. A signal is detected which is proportional to the difference in the amplitude of the voltages across the two coils which results in improved sensitivity while improving linearity and substantially reducing temperature dependence.

REFERENCES:
patent: 3218591 (1965-11-01), Caruthers
patent: 3691243 (1976-06-01), Schulz
patent: 4406999 (1983-09-01), Ward
patent: 4667158 (1987-05-01), Redlich

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